'Compulsion' definitions:

Definition of 'compulsion'

From: WordNet
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" [syn: compulsion, irresistible impulse]
noun
An irrational motive for performing trivial or repetitive actions, even against your will; "her compulsion to wash her hands repeatedly" [syn: compulsion, obsession]
noun
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" [syn: compulsion, coercion]

Definition of 'Compulsion'

From: GCIDE
  • Compulsion \Com*pul"sion\, n. [L. compulsio. See Compel.] The act of compelling, or the state of being compelled; the act of driving or urging by force or by physical or moral constraint; subjection to force. [1913 Webster]
  • If reasons were as plentiful as blackberries, I would give no man a reason upon compulsion. --Shak. [1913 Webster]
  • With what compulsion and laborious flight We sunk thus low. --Milton.
  • Syn: See Constraint. [1913 Webster]

Synonyms of 'compulsion'

From: Moby Thesaurus