The American Heritage® Dictionary of the English Language, 4th Edition
n. The act of compelling.
n. The state of being compelled.
n. An irresistible impulse to act, regardless of the rationality of the motivation: "The compulsion to protect the powerful from the discomfort of public disclosure feeds further abuse and neglect” ( Boston Globe).
n. An act or acts performed in response to such an impulse.
n. An irrational need to perform some action, often despite negative consequences.
n. The use of authority, influence, or other power to force (compel) a person or persons to act.
n. The lawful use of violence (i.e. by the administration).
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. The application (to a person) of superior force, physical or moral, overpowering or overruling his preferences; the force applied; constraint, physical or moral.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an irrational motive for performing trivial or repetitive actions, even against your will
n. an urge to do or say something that might be better left undone or unsaid
n. using force to cause something to occur
Word Usage
"But that their realization requires compulsion, and _compulsion in the form of a dictatorship_, is ordinarily not comprehended."