Etymology
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collision (n.)

"act of striking or dashing together," early 15c., from Late Latin collisionem (nominative collisio) "a dashing together," noun of action from past-participle stem of Latin collidere "to strike together" (see collide).

updated on January 20, 2018

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Definitions of collision from WordNet

collision (n.)
(physics) a brief event in which two or more bodies come together;
the collision of the particles resulted in an exchange of energy and a change of direction
Synonyms: hit
collision (n.)
an accident resulting from violent impact of a moving object;
the collision of the two ships resulted in a serious oil spill
three passengers were killed in the collision
collision (n.)
a conflict of opposed ideas or attitudes or goals;
a collision of interests
From wordnet.princeton.edu, not affiliated with etymonline.