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# expansion

noun (expansion, expansions; usually uncountable)

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

## Everyday

1. Getting bigger in size, amount or space. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#m1)
2. (science) The way a material takes up more space when it gets warmer. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#m2)
3. The growth of a business, a town or an empire into new places. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#m3)
4. (maths) Writing a number or an expression out in a longer form, such as 345 = 300 + 40 + 5. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#m4)

### In the lessons

In science it describes heat making solids, liquids and gases expand: railway tracks have gaps for expansion. In maths «expanded form» or «expansion» means writing a number as a sum of its place values, or multiplying out brackets. In history and business it means growing into new lands or markets. Phrases: rapid expansion, expansion of the town, thermal expansion.

### Examples

- The expansion of the balloon showed that the air inside was getting warmer. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#x1)
- Bridges have small gaps to allow for expansion on hot days. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#x2)
- The expansion of the school means we will get a new library. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#x3)
- Write 4,562 in expanded form: 4,000 + 500 + 60 + 2. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#x4)
- The company's expansion brought new jobs to the town. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#x5)
- The Roman Empire's expansion covered many lands. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#x6)
- Water's expansion when it freezes can crack a pipe. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/E/expansion/#x7)

### Note

Verb: expand; adjective: expansive (wide, open, or friendly and chatty). The opposite is contraction. Spelling: -sion, not -tion. In maths, expansion does not change the value: 345 and 300 + 40 + 5 are equal.

## On Mova

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