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# dual

«dual» in Mova's school dictionary: **Having two parts, uses or sides; double** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

adjective

### meaning for a pupil

1) Having two parts, uses or sides; double. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#m1)

2) dual nationality / dual citizenship: being a citizen of two countries at the same time. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#m2)

3) (maths) In some topics, dual means a matching partner shape or idea (for example, a cube and an octahedron are duals). [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#m3)

### sense in the lessons

In everyday life: dual carriageway (a road with two lanes each way, UK), dual-language books, dual controls in a learner car; in maths and geography; phrases: «dual carriageway», «dual citizenship», «dual purpose».

### examples

- My cousin has dual citizenship: Irish and Australian. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#x1)
- This book is dual-language, English on one page and French on the other. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#x2)
- Driving schools use cars with dual controls. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#x3)
- The road becomes a dual carriageway after the roundabout. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#x4)
- This tool has a dual purpose: a torch and a whistle. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#x5)
- The game has a dual-screen mode. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/D/dual/#x6)

### note

Homophone trap: dual (two) vs duel (a fight between two people). Tip: «dual» has «a» like «a pair». Not used about people (do not say «dual twins»).

### Trees and pragmatics

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