compulsion

noun

1. 1

   using force to cause something to occur

   though pressed into rugby under compulsion I began to enjoy the game

   they didn't have to use coercion

2. 2

   an urge to do or say something that might be better left undone or unsaid

   he felt a compulsion to babble on about the accident

3. 3

   an irrational motive for performing trivial or repetitive actions, even against your will

   her compulsion to wash her hands repeatedly