There are 2 definitions of Ac in English:

Ac1

Syllabification: Ac

symbol

The chemical element actinium.

Definition of Ac in:

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true

There are 2 definitions of Ac in English:

AC2

Syllabification: AC

abbreviation

1 (also ac) Alternating current.
1.1 (also ac) Air conditioning: a sedan with power steering and AC
1.2Before Christ.
[from Latin ante Christum]
1.3Appellation contrôlée: AC Sauvignon and Chardonnay
1.4Athletic club.
1.5 (ac.) North American Acre: a 22-ac. site

Definition of Ac in: