definition of
compulsion

[1] #1 compulsion n. [irresistible impulse] 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". wn

[2] #2 compulsion n. [obsession] an irrational motive for performing trivial or repetitive actions, even against your will; "her compulsion to wash her hands repeatedly". wn

[3] #3 compulsion n. [coercion] 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". wn