from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Something shaped like a curve or arch: the vivid arc of a rainbow.
  • n. Mathematics A segment of a circle.
  • n. An electric arc.
  • n. Astronomy The apparent path of a celestial body as it rises above and falls below the horizon.
  • intransitive v. To form an arc.
  • intransitive v. To move or seem to move in a curved path: the stars that arc across the sky.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A directed edge.
  • v. To move following a curved path.
  • v. To form an electrical arc.

from the GNU version of the Collaborative International Dictionary of English

  • n. A portion of a curved line.
  • n. A curvature in the shape of a circular arc or an arch
  • n. An arch.
  • n. The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night.
  • intransitive v. To form a voltaic arc, as an electrical current in a broken or disconnected circuit.

from The Century Dictionary and Cyclopedia

  • n. In geometry, any part of a curved line, as of a circle, especially one which does not include a point of inflection or cusp.
  • n. In astronomy, a part of a circle traversed by the sun or other heavenly body; especially, the part passed over by a star between its rising and setting.
  • n. In architecture, an arch.
  • n. Obsolete form of ark.
  • n. An abbreviation of Associate of the Royal College of Organists.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. something curved in shape
  • v. form an arch or curve
  • n. a continuous portion of a circle
  • n. electrical conduction through a gas in an applied electric field


Middle English ark, from Old French arc, from Latin arcus.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from Old French arc, from Latin arcus ("a bow, arc, arch"). (Wiktionary)


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