A task or ritual used repetitively to reduce anxiety; often accompanied by obsessions, as with obsessive-compulsive disorder.
Example: A woman must check the locks on all her doors and windows three times each before she can retire in the evening. If prevented from performing this ritual, she can’t fall asleep.
Grinnell, R. (2008). Compulsion. Psych Central. Retrieved on May 28, 2015, from http://psychcentral.com/encyclopedia/2008/compulsion/