collision

noun

1. (countable, uncountable)An instance of colliding.

   “He has retired due to the collision.”

   “At the very moment he cried out, David realised that what he had run into was only the Christmas tree. Disgusted with himself at such cowardice, he spat a needle from his mouth, stepped back from the tree and listened. There were no sounds of any movement upstairs: no shouts, no sleepy grumbles, only a gentle tinkle from the decorations as the tree had recovered from the collision.”

2. (countable, uncountable)Any event in which two or more bodies exert forces on each other in a relatively short time. In a collision, physical contact of two bodies is not necessary.
3. (abbreviation, alt-of, clipping, countable, uncountable)Clipping of naming collision.
4. (abbreviation, alt-of, clipping, countable, uncountable)Clipping of collision detection; tangibility.