collisional

collision

[kuh-lizh-uhn]
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:
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.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
collision (kəˈlɪʒən)
 
n
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
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Etymonline
Word Origin & History

collision
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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