Ac

UK: /ˌeɪˈsiː/

Collins Concise English Dictionary © HarperCollins Publishers::

Ac symbol:chemical

1. actinium

WordReference Random House Learner's Dictionary of American English © 2025

AC,  an abbreviation of:

1. Business air conditioning.
2. Electricity Also, ac, a.c., A.C. alternating current.

A/C or a/c, an abbreviation of:

1. Business
   • account.
2. air conditioning.

WordReference Random House Unabridged Dictionary of American English © 2025

AC, 

1. Business [Real Estate.] air conditioning.
2. Electricity alternating current.

Ac, [Chem.]

1. Chemistry acetate.
2. Chemistry acetyl.

Ac, [Symbol, Chem.]

1. Chemistry actinium.

ac, 

1. Electricity alternating current.

ac-, 

1. var. of ad- before c and qu: accede;
   acquire.

-ac, 

1. var. of -ic after Greek noun stems ending in i: cardiac;
   maniac.

• Greek -akos
• Latin -acus

A/C, 

1. [Bookkeeping.]
   • account.
   • account current.
2. [Real Estate.] air conditioning.
Also, a/c 

A.C., 

1. Business [Real Estate.] air conditioning.
2. Electricity alternating current.
3. before Christ.
• Latin ante Christum
4. Military Army Corps.
5. Sport Athletic Club.

a.c., 

1. Business [Real Estate.] air conditioning.
2. Electricity alternating current.
3. (in prescriptions) before meals.
• Latin ante cibum

Collins Concise English Dictionary © HarperCollins Publishers::

AC abbreviation

1. alternating current
   Compare DC
2. air conditioning
3. ante Christum
4. athletic club
5. Companion of the Order of Australia
6. appellation d'origine contrôlée: the highest French wine classification; indicates that the wine meets strict requirements concerning area of production, strength, etc
   See VDQS, vin de pays

Etymology: (for sense 3) Latin: before Christ

Collins Concise English Dictionary © HarperCollins Publishers::

ac abbreviation:Internet_domain_name

1. Ascension Island