Definition of "Compulsion" :

noun: using force to cause something to occur

"Though pressed into rugby under compulsion I began to enjoy the game."

noun: 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."

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

"Her compulsion to wash her hands repeatedly."