the act of colliding; a coming violently into contact; crash: the collision of two airplanes.
a clash; conflict: a collision of purposes.
Physics. the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum.

1400–50; late Middle English < Late Latin collīsiōn- (stem of collīsiō), equivalent to collīs(us) (past participle of collīdere to collide) + -iōn- -ion

collisional, adjective
anticollision, adjective

collision, collusion. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
collision (kəˈlɪʒən)
1.  a violent impact of moving objects; crash
2.  the conflict of opposed ideas, wishes, attitudes, etc: a collision of interests
3.  physics an event in which two or more bodies or particles come together with a resulting change of direction and, normally, energy
[C15: from Late Latin collīsiō from Latin collīdere to collide]

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

early 15c., from M.Fr. collision, from L. collisionem (nom. collisio), from collidere (see collide).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

collision definition

1. When two hosts transmit on a network at once causing their packets to corrupt each other.
See collision detection.
2. hash collision.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Encyclopedia Britannica


in physics, the sudden, forceful coming together in direct contact of two bodies, such as, for example, two billiard balls, a golf club and a ball, a hammer and a nail head, two railroad cars when being coupled together, or a falling object and a floor. Apart from the properties of the materials of the two objects, two factors affect the result of impact: the force and the time during which the objects are in contact. It is a matter of common experience that a hard steel ball dropped on a steel plate will rebound to almost the position from which it was dropped, whereas with a ball of putty or lead there is no rebound. The impact between the steel ball and plate is said to be elastic, and that between the putty or lead balls and plate is inelastic, or plastic; between these extremes there are varying degrees of elasticity and corresponding responses to impact. In a perfectly elastic impact (attained only at the atomic level), none of the kinetic energy of the coacting bodies is lost; in a perfectly plastic impact, the loss of kinetic energy is at a maximum.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They were two locomotives chugging toward a collision.
The avoidance of a political collision has helped economic confidence.
Scientists predict it may be so close that gravity could cause a catastrophic
Astronomers are watching what they believe is a remarkable collision between
  two asteroids deep in space.
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