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# aa

noun (aa — a kind of lava; also written «ʻaʻā»); abbreviation (AA)

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

## Everyday

1. (science) Aa (from Hawaiian «ʻaʻā») is a kind of lava that cools into rough, sharp, jagged lumps. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#m1)
2. (abbreviation) AA is a battery size: a small cylinder battery used in remote controls and toys («AA batteries»). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#m2)
3. (UK) The AA is the Automobile Association, which helps drivers whose cars break down. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#m3)
4. (abbreviation) AA also means Alcoholics Anonymous, a group that helps people stop drinking alcohol. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#m4)

### In the lessons

In science lessons about volcanoes, aa lava is contrasted with pahoehoe, which is smooth and ropy. In everyday life «AA» is most often a battery size: AA is bigger than AAA. On road signs in the UK, yellow AA signs show detours. Say «ah-ah» for the lava.

### Examples

- Aa lava is rough and sharp, so you must never walk on it. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#x1)
- The remote needs two AA batteries. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#x2)
- AAA batteries are thinner than AA ones. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#x3)
- Our car broke down, so Dad called the AA. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#x4)
- On Hawaii we saw fields of black aa lava. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#x5)
- The scientist explained the difference between aa and pahoehoe. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/A/aa/#x6)

### Note

The lava word is Hawaiian and sounds like «ah-ah». Capital «AA» is an abbreviation: for batteries, the Automobile Association, or Alcoholics Anonymous — which one depends on context. Not a normal English word on its own.

## On Mova

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