"collision" in the noun sense
1. collision, hit
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"
2. collision
an accident resulting from violent impact of a moving object
"three passengers were killed in the collision"
"the collision of the two ships resulted in a serious oil spill"
3. collision
a conflict of opposed ideas or attitudes or goals
"a collision of interests"
Source: WordNet® (An amazing lexical database of English)
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