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

  • n. The act or process of colliding; a crash or conflict.
  • n. Physics A brief dynamic event consisting of the close approach of two or more particles, such as atoms, resulting in an abrupt change of momentum or exchange of energy.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An instance of colliding.

from the GNU version of the Collaborative International Dictionary of English

  • n. The act of striking together; a striking together, as of two hard bodies; a violent meeting, as of railroad trains; a clashing.
  • n. A state of opposition; antagonism; interference.

from The Century Dictionary and Cyclopedia

  • n. The act of striking or dashing together; a striking together of two bodies; the meeting and mutual striking or clashing of two or more moving bodies, or of a moving body with a stationary one; specifically, in recent use, the dashing together of two railroad-trains, or of two boats or ships.
  • n. Opposition; antagonism; counteraction: as, a collision of interests or of parties.
  • n. See extract.
  • n. Synonyms Concussion, etc. See shock.
  • To collide; strike against.

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

  • n. a conflict of opposed ideas or attitudes or goals
  • n. (physics) a brief event in which two or more bodies come together
  • n. an accident resulting from violent impact of a moving object


Middle English, from Late Latin collīsiō, collīsiōn-, from Latin collīsus, past participle of collīdere, to collide; see collide.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Late Latin collisio, from Latin collidere, past participle collisus ("to dash together"); see collide. (Wiktionary)



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