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Geometry. any unbroken part of the circumference of a circle or other curved line.
Also called electric arc. Electricity. a luminous bridge formed in a gap between two electrodes. Compare spark1 ( def 2 ).
Astronomy. the part of a circle representing the apparent course of a heavenly body.
anything bow-shaped.
verb (used without object), arced [ahrkt] or arcked, arcing [ahr-king] or arcking.
to form an electric arc.
to move in a curve suggestive of an arc.

1350–1400; Middle English ark < Latin arcus bow, arch, curve

arc, ark.


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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
abbreviation for
Associate of the Royal College of Science

arc (ɑːk)
1.  something curved in shape
2.  part of an unbroken curved line
3.  a luminous discharge that occurs when an electric current flows between two electrodes or any other two surfaces separated by a small gap and a high potential difference
4.  astronomy a circular section of the apparent path of a celestial body
5.  maths a section of a curve, graph, or geometric figure
vb , arcs, arcing, arced, arcs, arcking, arcked
6.  (intr) to form an arc
7.  maths specifying an inverse trigonometric function: usually written arcsin, arctan, arcsec, etc, or sometimes sin--1, tan--1, sec--1, etc
[C14: from Old French, from Latin arcus bow, arch]

abbreviation for
AIDS-related complex: an early condition in which a person infected with the AIDS virus may suffer from such mild symptoms as loss of weight, fever, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. arc, from L. arcus "a bow, arch," from PIE base *arqu- "bowed, curved" (cf. Goth. arhvazna "arrow," O.E. earh, O.N. ör). Electrical sense is from 1821.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

arc (ärk)
A curved line or segment of a circle.

ARC abbr.
AIDS-related complex

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
arc   (ärk)  Pronunciation Key 
  1. A segment of a circle.

  2. See electric arc.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

ARCS definition


The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
assessment and remediation of contaminated sediments
  1. Addiction Research Center

  2. advance readers copy

  3. AIDS-related complex

  4. amateur radio club

  5. American Red Cross

  6. [National Aeronautics and Space Administration] Ames Research Center

  7. Appalachian Regional Commission

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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Example sentences for arcs
As the series began to gather momentum, new story arcs were introduced.
The runup to this saw the first arcs of new series stickleback and kingdom.
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