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# invariable

adjective (invariable); noun (an invariable — maths, rare)

«invariable» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. Invariable means never changing; always the same. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#m1)
2. (grammar) An invariable word does not change its form, for example «sheep» has the same singular and plural. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#m2)
3. (maths, rare) An invariable or invariant is a value that stays the same when other things change. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#m3)

### In the lessons

In formal writing and stories it means «always the same»: «his invariable breakfast of toast». In grammar lessons, invariable nouns like «sheep», «deer» and «fish» have the same plural. Related adverb: invariably (always). Phrases: «an invariable rule», «invariable habit».

### Examples

- Her invariable answer was «Maybe later». [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#x1)
- Grandpa had an invariable habit of reading the paper after lunch. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#x2)
- The rule is invariable: no phones in class. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#x3)
- «Sheep» is an invariable noun: one sheep, two sheep. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#x4)
- His invariable smile cheered everyone up. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#x5)
- Nothing in nature is truly invariable. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#x6)
- The same devices are in almost all cases resorted to, and their effect is invariable. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/#x7)

### Note

Adjective, formal. Adverb: invariably (more common: «It invariably rains on sports day»). In- (not) + variable (able to change). Opposite: variable. In maths, «variable» is also a letter that stands for a number, and «constant» is the usual word for a value that does not change.

## On Mova

- [Trees and pragmatics of «invariable» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/invariable/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«invariable» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/invariable.html) on Mova free.