A.C.

1. Real Estate. air conditioning.

2. Elect. alternating current.

3. before Christ. [ < L ante Christum]

4. Army Corps.

5. Athletic Club.

* * *

ac-,

prefix. the form of ad- (Cf. ↑ad-) before c, k, and q, as in accede, acknowledgment, acquaint.

ac.,

acre or acres.

a.c. or a-c,

alternating current (of electricity).

Usage These abbreviations are now widely used as modifiers: »

an a.c. motor.

Ac (no period),

1. actinium (chemical element).

2. alto-cumulus (clouds).

AC (no periods),

1. U.S. Air Corps (before World War II).

2. alternating current.

A/C or a/c (no periods),

Commerce.

1. account.

2. account current.

A.C.,

1. British. aircraftsman.

2. alternating current.

3. before Christ (Latin, ante Christum).