Collins Concise English Dictionary © HarperCollins Publishers::
a/c abbreviation for
  1. account
  2. account current
WordReference Random House Learner's Dictionary of American English © 2019
AC,  an abbreviation of:
  1. Businessair conditioning.
  2. ElectricityAlso, 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 © 2019
AC, 
  1. Business[Real Estate.]air conditioning.
  2. Electricityalternating current.

Ac, [Chem.]
  1. Chemistryacetate.
  2. Chemistryacetyl.

Ac, [Symbol, Chem.]
  1. Chemistryactinium.

ac, 
  • Electricityalternating current.

  • ac-, 
  • var. of  ad- before c and qu: accede;
    acquire.

  • -ac, 
  • 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. Electricityalternating current.
    3. before Christ.
      • Latin ante Christum
    4. MilitaryArmy Corps.
    5. SportAthletic Club.

    a.c., 
    1. Business[Real Estate.]air conditioning.
    2. Electricityalternating current.
    3. (in prescriptions) before meals.
    • Latin ante cibum

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