An incentive to act in a particular way; a reason or emotion that makes one want to do something; anything that prompts a choice of action. [from 15th c.] Synonym: **motivation
(obsolete, rare) A limb or other bodily organ that can move. [15th-17th c.](Can we find and add a quotation of Shakespeare to this entry?)
(law) Something which causes someone to want to commit a crime; a reason for criminal behaviour. [from 18th c.]