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AC

1.
Real Estate. air conditioning.
2.
Electricity. alternating current.

Ac

Chemistry
1.
2.

Ac

Symbol, Chemistry
1.

ac

1.
Electricity. alternating current.

ac-

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

-ac

1.
variant of -ic after Greek noun stems ending in i: cardiac; maniac.
Origin
< Latin -acus < Greek -akos

A/C

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

A.C.1

1.
before Christ.
Origin
< Latin ante Christum

A.C.2

1.
Real Estate. air conditioning.
2.
Electricity. alternating current.
3.
Army Corps.
4.
Athletic Club.

a.c.1

1.
(in prescriptions) before meals.
Origin
< Latin ante cibum

a.c.2

1.
Real Estate. air conditioning.
2.
Electricity. alternating current.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for AC

ac

abbreviation
1.
Ascension Island

Ac

Chemical symbol
1.
actinium

AC

abbreviation
1.
alternating current Compare DC
2.
ante Christum
3.
Air Corps
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, vin de table
7.
Aelodau'r Cynulliad: Member of the Assembly (that is, the National Assembly of Wales)
Word Origin
(for sense 2) Latin: before Christ

a/c

abbreviation
1.
account
2.
account current

A/C

abbreviation
1.
(in Canada) Air Commodore

a.c.

abbreviation
1.
(in prescriptions) ante cibum
Word Origin
Latin: before meals
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for AC

abbreviation of air conditioning, by 1966.

Online Etymology Dictionary, © 2010 Douglas Harper
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AC in Medicine

ac abbr.
Latin ante cibum (before a meal)

Ac 1

The symbol for the element actinium.

ac- pref.
Variant of ad-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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AC in Science
Ac  
The symbol for actinium.
AC  
Abbreviation of alternating current
actinium
  (āk-tĭn'ē-əm)   
Symbol Ac
A silvery-white, highly radioactive metallic element of the actinide series that is found in uranium ores. It is about 150 times more radioactive than radium and is used as a source of alpha rays and neutrons. Its most stable isotope has a half-life of about 22 years. Atomic number 89; melting point 1,050°C (1,922°F); boiling point (estimated) 3,200°C (5,792°F); specific gravity (calculated) 10.07; valence 3. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for AC

Ac

  1. actinium
  2. Acts of the Apostles

AC

  1. adult contemporary
  2. air conditioning
  3. alternating current

a.c.

Latin ante cibum (before meals)

A.C.

  1. Latin anno Christi (the year of Christ)
  2. appellate court
  3. Army Corps
  4. Athletic Club

a/c

  1. account
  2. account current
  3. air conditioning

A/C

aircraft
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Article for AC

Ac

(Ac), radioactive chemical element, in Group IIIb of the periodic table, atomic number 89. Actinium was discovered (1899) by Andre-Louis Debierne in pitchblende residues left after Pierre and Marie Curie had extracted radium and was also discovered (1902) independently by Friedrich Otto Giesel. A ton of pitchblende ore contains about 0.15 mg of actinium. The rare, silvery-white metal is highly radioactive, glowing blue in the dark

Learn more about Ac with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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