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# O

[A](https://md.mova.elamur.ai/free/en/dictionaries/school/A/)[B](https://md.mova.elamur.ai/free/en/dictionaries/school/B/)[C](https://md.mova.elamur.ai/free/en/dictionaries/school/C/)[D](https://md.mova.elamur.ai/free/en/dictionaries/school/D/)[E](https://md.mova.elamur.ai/free/en/dictionaries/school/E/)[F](https://md.mova.elamur.ai/free/en/dictionaries/school/F/)[G](https://md.mova.elamur.ai/free/en/dictionaries/school/G/)[H](https://md.mova.elamur.ai/free/en/dictionaries/school/H/)[I](https://md.mova.elamur.ai/free/en/dictionaries/school/I/)[J](https://md.mova.elamur.ai/free/en/dictionaries/school/J/)[K](https://md.mova.elamur.ai/free/en/dictionaries/school/K/)[L](https://md.mova.elamur.ai/free/en/dictionaries/school/L/)[M](https://md.mova.elamur.ai/free/en/dictionaries/school/M/)[N](https://md.mova.elamur.ai/free/en/dictionaries/school/N/)[O](https://md.mova.elamur.ai/free/en/dictionaries/school/O/)[P](https://md.mova.elamur.ai/free/en/dictionaries/school/P/)[Q](https://md.mova.elamur.ai/free/en/dictionaries/school/Q/)[R](https://md.mova.elamur.ai/free/en/dictionaries/school/R/)[S](https://md.mova.elamur.ai/free/en/dictionaries/school/S/)[T](https://md.mova.elamur.ai/free/en/dictionaries/school/T/)[U](https://md.mova.elamur.ai/free/en/dictionaries/school/U/)[V](https://md.mova.elamur.ai/free/en/dictionaries/school/V/)[W](https://md.mova.elamur.ai/free/en/dictionaries/school/W/)[X](https://md.mova.elamur.ai/free/en/dictionaries/school/X/)[Y](https://md.mova.elamur.ai/free/en/dictionaries/school/Y/)[Z](https://md.mova.elamur.ai/free/en/dictionaries/school/Z/)

416 words

**1**[2](https://md.mova.elamur.ai/free/en/dictionaries/school/O/page/2/)[3](https://md.mova.elamur.ai/free/en/dictionaries/school/O/page/3/)[4](https://md.mova.elamur.ai/free/en/dictionaries/school/O/page/4/)[5](https://md.mova.elamur.ai/free/en/dictionaries/school/O/page/5/)

1. [**oaf**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oaf.md) noun (oafs) A clumsy or stupid person who is awkward and slow.
2. [**oak**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oak.md) noun (oak, oaks; also oak tree); adjective (made of oak) An oak is a big tree with hard wood that can live for hundreds of years.
3. [**oaken**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oaken.md) adjective (oaken) Made of oak wood.
4. [**oar**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oar.md) noun (an oar, oars) An oar is a long pole with a flat blade at one end, used to row a boat.
5. [**oas**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oas.md) abbreviation (OAS); fragment OAS: the Organization of American States, a group of countries in North, Central and South America that work together.
6. [**oasis**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oasis.md) noun (an oasis, oases) A place in a desert where there is water, so plants and trees such as date palms can grow.
7. [**oat**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oat.md) noun (oats — usually plural; oat as an adjective: oat milk) 1) A kind of cereal plant grown for its grain. 2) (oats) The grains of this plant, used to make porridge, oatcakes, flapjacks and muesli…
8. [**oath**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oath.md) noun (an oath, oaths) 1) An oath is a serious promise, often in front of others or in a court, that you will tell the truth or do something: "the witness took…
9. [**oatmeal**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oatmeal.md) noun (oatmeal — uncountable); adjective (oatmeal — a colour) Oats that have been crushed or ground, used to make porridge, oatcakes and biscuits.
10. [**obedience**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obedience.md) noun (obedience, uncountable) Doing what you are told by someone in charge, or following rules and laws.
11. [**obedient**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obedient.md) adjective (obedient; more obedient) 1) Doing what you are told by a parent, teacher, rule or owner. 2) (of animals) Trained to follow commands, as in "an obedient dog".
12. [**obeisance**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obeisance.md) noun (obeisances) (formal, old use) A low bow or other sign of respect to someone important.
13. [**oberon**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oberon.md) noun (Oberon) (a name) 1) (a name) The king of the fairies in old European folklore and stories. 2) (science) The second-largest moon of the planet Uranus.
14. [**obesity**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obesity.md) noun (obesity — uncountable) The condition of having much more body fat than is healthy, which can lead to illnesses such as diabetes and heart disease.
15. [**obey**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obey.md) verb (obey, obeys, obeyed, obeying) 1) To do what a person, rule or law tells you to do.
16. [**obituary**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obituary.md) noun (an obituary, obituaries) A piece of writing in a newspaper or website, after someone has died, telling about their life and what they did.
17. [**object**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/object.md) noun (an object, objects); verb (object, objects, objected, objecting) An object (OB-ject) is a thing you can see and touch that is not alive.
18. [**objection**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/objection.md) noun (an objection, objections) An objection is a reason you give for not agreeing with something or not liking a plan.
19. [**objectionable**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/objectionable.md) adjective (objectionable; more objectionable) 1) (formal) Unpleasant or offensive, so that people object to it.
20. [**objective**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/objective.md) noun (an objective, objectives); adjective (objective) An aim or goal you are trying to reach (the lesson objective).
21. [**obligation**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obligation.md) noun (an obligation, obligations) An obligation is something you must do because a rule, a promise or your duty says so.
22. [**obligatorily**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obligatorily.md) adverb (obligatorily) 1) (formal) Because a rule or law says you must; in a way that is required, not a choice.
23. [**obligatory**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obligatory.md) adjective (obligatory) Obligatory means something you must do because a rule or law says so; it is not a free choice.
24. [**oblige**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oblige.md) verb (oblige, obliges, obliged, obliging) To oblige someone means to force them to do something by law, a rule or duty.
25. [**obliged**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obliged.md) adjective (obliged); verb past form of oblige (oblige, obliges, obliged, obliging) Obliged means having to do something because of a rule, law or duty: You are obliged to wear a seat belt.
26. [**oblique**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oblique.md) adjective (oblique; more oblique); noun (an oblique — UK, the slash sign /) Oblique means slanting, not straight up and not flat; at an angle.
27. [**obliterated**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obliterated.md) verb form (past tense and past participle of obliterate: obliterate, obliterates, obliterated, obliterating); adjective (obliterated) 1) Destroyed completely so that nothing is left. 2) Covered or hidden so that it cannot be seen, as in "footprints obliterated by snow".…
28. [**oblivion**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oblivion.md) noun (oblivion — uncountable) The state of being completely forgotten: the old song fell into oblivion.
29. [**oboe**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oboe.md) noun (oboe, oboes) 1) An oboe is a woodwind musical instrument shaped like a long thin tube, played by blowing through a double reed, which makes a clear…
30. [**oboist**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oboist.md) noun (an oboist, oboists) 1) A person who plays the oboe, a woodwind instrument with a double reed.
31. [**obscene**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obscene.md) adjective (obscene, more obscene) Obscene means very rude and shocking, especially about sex or the body, and not acceptable in public.
32. [**obscenity**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obscenity.md) noun (obscenity — uncountable; an obscenity, obscenities) A very rude or offensive word, especially a swear word.
33. [**obscure**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obscure.md) adjective (obscure, more obscure, most obscure); verb (obscure, obscures, obscured, obscuring) Not well known (an obscure singer, an obscure village).
34. [**obscurity**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obscurity.md) noun (obscurities) 1) The state of being hidden, unknown or unclear. 2) The state of not being famous or well known.
35. [**observable**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/observable.md) adjective (observable) 1) Observable means able to be seen or noticed. 2) (science) An observable fact is one you can check by looking, measuring or testing.
36. [**observance**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/observance.md) noun (observance, observances) Following or obeying a law, rule or custom: «observance of the rules».
37. [**observation**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/observation.md) noun (an observation, observations) Observation is watching something carefully to learn about it.
38. [**observatory**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/observatory.md) noun (an observatory, observatories) An observatory is a building with big telescopes and instruments for watching and studying stars, planets and space.
39. [**observe**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/observe.md) verb (observe, observes, observed, observing) To observe is to watch something carefully to learn about it.
40. [**observed**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/observed.md) verb (past and past participle of «observe»: observe, observes, observed, observing); adjective (observed) Watched or looked at carefully, often to learn something.
41. [**observer**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/observer.md) noun (an observer, observers) A person who watches something carefully, often to learn or to report.
42. [**obsessed**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obsessed.md) adjective (obsessed; more obsessed); verb form (past tense and past participle of obsess: obsess, obsesses, obsessed, obsessing) Thinking about something or someone all the time, so it fills your mind.
43. [**obsidian**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obsidian.md) noun (obsidian; uncountable) Obsidian is a hard, shiny black (or dark) natural glass that forms when lava from a volcano cools very quickly.
44. [**obsolete**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obsolete.md) adjective (obsolete) Obsolete means no longer used because something newer or better has replaced it.
45. [**obstacle**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obstacle.md) noun (an obstacle, obstacles) 1) Something in your way that stops you or makes it hard to go forward. 2) A problem or difficulty that makes it hard to do something.
46. [**obstinacy**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obstinacy.md) noun (obstinacies) The state of refusing to change your mind or give in, even when you should.
47. [**obstinate**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obstinate.md) adjective (obstinate, more obstinate, most obstinate) Stubborn; refusing to change your mind or to do as you are told.
48. [**obstruct**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obstruct.md) verb (obstruct, obstructs, obstructed, obstructing) To block a road, path, pipe or opening so things cannot pass.
49. [**obstruction**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obstruction.md) noun (an obstruction, obstructions; uncountable obstruction) An obstruction is something that blocks a road, path, pipe or passage so that things cannot get through.
50. [**obtain**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obtain.md) verb (obtain, obtains, obtained, obtaining) 1) (formal) To get something, especially by effort or by asking. 2) (formal, rare) To exist or be in use (of rules).
51. [**obtainable**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obtainable.md) adjective (obtainable) Obtainable means able to be got or bought: "the tickets are obtainable from the office".
52. [**obtuseness**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obtuseness.md) noun (obtuseness — uncountable) Slowness to understand things; not noticing what is obvious.
53. [**obviate**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obviate.md) verb (obviate, obviates, obviated, obviating) 1) (formal) To remove a need or a problem, so that something is no longer necessary, as in "This obviates the need for…".
54. [**obviating**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obviating.md) verb form (present participle of obviate: obviate, obviates, obviated, obviating) 1) (formal) Removing a need or problem, so that something is no longer necessary.
55. [**obvious**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obvious.md) adjective (obvious, more obvious, most obvious) 1) Easy to see, notice or understand; clear to everyone. 2) Too easy or expected; not clever (an obvious joke).
56. [**obviously**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/obviously.md) adverb (obviously) In a way that is easy to see or understand; clearly.
57. [**occasion**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occasion.md) noun (an occasion, occasions); verb (occasion, occasioned — formal) A particular time when something happens (on this occasion).
58. [**occasional**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occasional.md) adjective (occasional) Occasional means happening sometimes, but not often or regularly.
59. [**occasionally**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occasionally.md) adverb (occasionally) 1) Occasionally means sometimes, but not often or regularly.
60. [**occasions**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occasions.md) noun, plural of occasion (an occasion, occasions); verb (occasion, formal) Times when something happens: «on three occasions» means three times.
61. [**occident**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occident.md) noun (the occident; usually with «the») The Occident is the Western part of the world, meaning Europe and the countries settled from it.
62. [**occlusion**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occlusion.md) noun (occlusion, occlusions; also uncountable) A blocking or closing of a tube, pipe or blood vessel.
63. [**occupant**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occupant.md) noun (an occupant, occupants) An occupant is a person who lives in a house or flat, or who is in a room, seat or car at a certain time.
64. [**occupation**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occupation.md) noun (an occupation, occupations) An occupation is a job or the kind of work a person does.
65. [**occupational**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occupational.md) adjective (occupational) 1) To do with a person's job or work. 2) Caused by or happening because of someone's work, as in "occupational injury".
66. [**occupied**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occupied.md) verb (past of «occupy»: occupy, occupies, occupied, occupying); adjective (occupied) Being used by someone, not free (the toilet is occupied, an occupied seat).
67. [**occupy**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occupy.md) verb (occupy, occupies, occupied, occupying) 1) To live in or use a building, room or space. 2) To fill time or keep someone busy. 3) To take control of a place by force, such as an…
68. [**occur**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occur.md) verb (occur, occurs, occurred, occurring) 1) (formal) To happen, especially without being planned. 2) To be found or to exist somewhere. 3) occur to someone: to come into someone's…
69. [**occurrence**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/occurrence.md) noun (an occurrence, occurrences) 1) Something that happens; an event. 2) The fact of something happening or how often it happens (the occurrence of storms). 3) (formal)…
70. [**ocean**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/ocean.md) noun (an ocean, oceans) The huge body of salt water that covers most of the Earth.
71. [**oceanic**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oceanic.md) adjective (oceanic) 1) To do with the ocean or living in the ocean. 2) Like an ocean: very big and wide. 3) (geography) To do with Oceania, the region of…
72. [**ocelot**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/ocelot.md) noun (an ocelot, ocelots) An ocelot is a wild cat about twice the size of a pet cat, with spotted and striped fur, living in the forests of Central and South America.
73. [**oct**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oct.md) abbreviation 1) Oct. — short for October, the tenth month. 2) Short for octave in music, or octal (base 8) in computing and maths.
74. [**october**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/october.md) noun (October) 1) October is the tenth month of the year. It has 31 days and comes after September and before November.
75. [**octopod**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/octopod.md) noun (an octopod, octopods); adjective (octopod) An animal with eight arms or legs, especially an octopus.
76. [**octopus**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/octopus.md) noun (an octopus, octopuses / octopi) 1) A sea animal with a soft, round body and eight long arms covered in suckers.
77. [**odd**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/odd.md) adjective (odd, odder, oddest); noun in «odds» An odd number cannot be split into two equal whole groups, like 1, 3, 5 or 7.
78. [**oddball**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oddball.md) noun (an oddball, oddballs); adjective (oddball) — informal 1) (informal) A person who behaves in a strange or unusual way. 2) (informal, adjective) Strange or unusual: an oddball idea.
79. [**oddity**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oddity.md) noun (an oddity, oddities) 1) A strange or unusual person, thing or event. 2) Being strange or unusual (uncountable).
80. [**oddly**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oddly.md) adverb (oddly) 1) Oddly means in a strange or unusual way. 2) Oddly (enough) means surprisingly.
81. [**ode**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/ode.md) noun (an ode, odes) A poem that praises or speaks to someone or something, often in a grand, serious style.
82. [**odious**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/odious.md) adjective 1) Odious means very unpleasant, hateful, so that people cannot bear it. 2) Odious describes a person who is spiteful and unkind.
83. [**odor**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/odor.md) noun (odor, odors; British spelling «odour») 1) An odor is a smell, especially a strong or pleasant one. 2) An odor can be a bad smell that hangs in the air.
84. [**odorous**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/odorous.md) adjective 1) Odorous means having a smell, usually a pleasant or strong one. 2) (old use) Odorous describes something sweet-smelling, like flowers.
85. [**odour**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/odour.md) noun (an odour, odours) — UK, Canada, Australia, New Zealand, Ireland spelling; odor in the USA An odour is a smell, often an unpleasant one: "a strange odour came from the bin".
86. [**odourless**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/odourless.md) adjective (odourless; US odorless) 1) Odourless means having no smell at all. 2) (science) An odourless gas or liquid cannot be noticed by your nose.
87. [**odyssey**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/odyssey.md) noun (an odyssey, odysseys); proper noun (the Odyssey) A long, exciting journey full of adventures and difficulties.
88. [**oesophagus**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/oesophagus.md) noun (the oesophagus, oesophaguses or oesophagi) 1) The oesophagus is the muscular tube that carries food and drink from your mouth and throat down to your stomach.
89. [**of**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/of.md) preposition; casual spelling «a» or «o'» (lotta, cuppa, o'clock) Of links a part to the whole it belongs to: a piece of cake, 3 of the apples.
90. [**off**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/off.md) preposition, adverb; adjective (the light is off; the milk is off) Off means away from a surface or from a place: take it off the table.
91. [**offence**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offence.md) noun (an offence, offences) An offence is a crime or an act that breaks a law or rule.
92. [**offend**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offend.md) verb (offend, offends, offended, offending) To make someone upset, hurt or annoyed by what you say or do.
93. [**offended**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offended.md) verb, past of offend; adjective (feel offended) 1) Feeling hurt, upset or insulted by what someone said or did. 2) Past form of offend: made someone upset. 3) (formal) Broke a law.
94. [**offender**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offender.md) noun (an offender, offenders) A person who has broken the law or done a crime.
95. [**offending**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offending.md) adjective (offending); verb form (-ing of offend: offend, offends, offended, offending) Offending means upsetting someone or making them feel hurt or insulted.
96. [**offense**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offense.md) noun (offense, offenses; British spelling «offence», offences) An offense is a wrong that someone does, a bad action or a crime.
97. [**offensive**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offensive.md) adjective (offensive words, more offensive); noun (an offensive, offensives) 1) Rude or insulting, likely to upset people. 2) Very unpleasant to the senses: an offensive smell. 3) (sport, US) To do with attacking…
98. [**offensiveness**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offensiveness.md) noun (offensiveness, uncountable) Offensiveness is the quality of being rude or hurtful, so that it upsets or insults people.
99. [**offer**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offer.md) verb (offer, offers, offered, offering); noun (an offer, offers) To offer is to say you will give something to someone, or to hold it out for them to take.
100. [**offering**](https://md.mova.elamur.ai/free/en/dictionaries/school/w/offering.md) noun (an offering, offerings); verb form (offering — from offer) An offering is something you give, especially as a gift.

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