definitions

ac

|

Electricity. alternating current.

RELATED WORDS

magnetic, electrical, heat, service, rousing, dynamic, tense, stirring, DC, voltaic, tension, light, current, juice, spark, galvanism, utilities, electron, voltage, ignition

Nearby words

abyssinian well, abyssopelagic, abyssopelagic zone, abzug, abélard, ac, ac and u, ac-, ac/dc, aca, acaa

Definition for ac (2 of 11)

Ac

Chemistry.

acetate.
acetyl.

Definition for ac (3 of 11)

Ac

Symbol, Chemistry.

actinium.

Definition for ac (4 of 11)

AC

Real Estate. air conditioning.
Electricity. alternating current.

Definition for ac (5 of 11)

ac-

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

Definition for ac (6 of 11)

-ac

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

Origin of -ac

< Latin -acus < Greek -akos

Definition for ac (7 of 11)

a.c.

1

(in prescriptions) before meals.

Origin of a.c.

1
From the Latin word ante cibum

Definition for ac (8 of 11)

a.c.

2

Real Estate. air conditioning.
Electricity. alternating current.

Definition for ac (9 of 11)

A.C.

1

before Christ.

Origin of A.C.

1
From the Latin word ante Christum

Definition for ac (10 of 11)

A.C.

2

Real Estate. air conditioning.
Electricity. alternating current.
Army Corps.
Athletic Club.

Definition for ac (11 of 11)

A/C

or a/c

Bookkeeping.
  1. account.
  2. account current.
Real Estate. air conditioning.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ac

British Dictionary definitions for ac (1 of 6)

ac

the internet domain name for

Ascension Island

British Dictionary definitions for ac (2 of 6)

Ac

the chemical symbol for

actinium

British Dictionary definitions for ac (3 of 6)

AC

abbreviation for

Word Origin for AC

(for sense 2) Latin: before Christ

British Dictionary definitions for ac (4 of 6)

a/c

/ accounting /

abbreviation for

account
account current

British Dictionary definitions for ac (5 of 6)

A/C

abbreviation for

(in Canada) Air Commodore

British Dictionary definitions for ac (6 of 6)

a.c.

/ obsolete /

abbreviation for

(in prescriptions) ante cibum

Word Origin for a.c.

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

Word Origin and History for ac

AC

abbreviation of air conditioning, by 1966.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for ac (1 of 3)

ac

abbr.

ante cibum (before a meal)

Medicine definitions for ac (2 of 3)

Ac

The symbol for the elementactinium

Medicine definitions for ac (3 of 3)

ac-

pref.

Variant ofad-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for ac (1 of 3)

Ac

The symbol for actinium.

Science definitions for ac (2 of 3)

AC

Abbreviation of alternating current

Science definitions for ac (3 of 3)

actinium

[ ăk-tĭn′ē-əm ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.