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# perturbation

«perturbation» in Mova's school dictionary: **Worry or anxiety; being upset: "She showed no perturbation."** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (a perturbation, perturbations)

### meaning for a pupil

1) (formal) Worry or anxiety; being upset: "She showed no perturbation." [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#m1)

2) (science) A small change or disturbance in the movement or state of something, such as a planet's orbit being pulled by another planet. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#m2)

### sense in the lessons

In science and astronomy, perturbations in Uranus's orbit led astronomers to discover Neptune in 1846. In maths and physics, a perturbation is a small push or change. In old-fashioned stories, it means worry.

### examples

- Small perturbations in Uranus's orbit helped find Neptune. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#x1)
- He listened without any sign of perturbation. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#x2)
- The spacecraft corrected for perturbations in its path. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#x3)
- A tiny perturbation can change the weather a lot. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#x4)
- Her perturbation grew as the dog did not come home. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#x5)
- Scientists measured the perturbation caused by the moon. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/#x6)

### note

Formal. Verb: perturb (to worry); adjective: perturbed (worried), unperturbed (calm). In science it means a small disturbance, not a big crash.

### Trees and pragmatics

[Every meaning and example of «perturbation» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/P/perturbation/), each sentence with its dependency tree and frames.