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collisional

 [kuh-lizh-uhn]   Origin

col·li·sion

   [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

Related forms
col·li·sion·al, adjective
an·ti·col·li·sion, adjective

Can be confused: collision, collusion.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collisional is always a great word to know.
So is flibbertigibbet. Does it mean:
a scrap or morsel of food left at a meal.
a chattering or flighty, light-headed person.
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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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