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collision

[kuh-lizh-uh n] /kəˈlɪʒ ən/
noun
1.
the act of colliding; a coming violently into contact; crash:
the collision of two airplanes.
2.
a clash; conflict:
a collision of purposes.
3.
Physics. the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum.
Origin
late Middle English
1400-1450
1400-50; late Middle English < Late Latin collīsiōn- (stem of collīsiō), equivalent to collīs(us) (past participle of collīdere to collide) + -iōn- -ion
Related forms
collisional, adjective
anticollision, adjective
Can be confused
collision, collusion.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anti-collision

collision

/kəˈlɪʒən/
noun
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
Word Origin
C15: from Late Latin collīsiō from Latin collīdere to collide
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
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Word Origin and History for anti-collision

collision

n.

early 15c., from Middle French collision (15c.), from Latin collisionem (nominative collisio) "a dashing together," noun of action from collidere (see collide).

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for anti-collision

collision

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.

Learn more about collision with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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