collision in WordNet English dictionary

1. a conflict of opposed ideas or attitudes or goals
   "a collision of interests"
   collision 
   
2. 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"
   collision 
   
3. (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"
   collision  hit