There are 2 main definitions of Ac in English:

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Ac 1

symbol

The chemical element actinium.

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There are 2 main definitions of Ac in English:

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AC 2

Pronunciation: /ˌeɪˈsiː/

abbreviation

1 (also a.c.) Alternating current: [as modifier]: the AC supply
3Aircraftman or Aircraftwoman.
5Athletic club.
6 (ac.) North American Acre: a 22-ac. site
7Before Christ.
From Latin ante Christum
8Companion of the Order of Australia.

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