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col·li·sion  (k-lzhn)
1. The act or process of colliding; a crash or conflict.
2. 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.

[Middle English, from Late Latin collsi, collsin-, from Latin collsus, past participle of colldere, to collide; see collide.]

col·lision·al adj.
col·lision·al·ly adv.
Synonyms: collision, concussion, crash1, impact, jar2, jolt, shock1
These nouns denote violent forcible contact between two or more things: the midair collision of two light planes; the concussion caused by an explosion; a crash involving two cars; the impact of a sledgehammer on pilings; felt repeated jars as the train ground to a halt; a series of jolts as the baby carriage rolled down the steps; experienced the physical shock of a sudden fall.

collision  /kln/  n. [C;U] 1 a crashing together: Two cars were involved in a collision. 2 to be on a collision course: a. to be headed toward crashing together: two cars on a collision course b. to be headed for an argument or other conflict: The two politicians are on a collision course over raising taxes. collision

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