1. (n.) Fixed and strong desire; esp. natural desire; a craving; an eager appetite.

2. (n.) Specifically: An instinctive inclination or propensity in animals to perform certain actions, as in the young to suck, in aquatic fowls to enter into water and to swim; the tendency of an organized body to seek what satisfies the wants of its organism.

3. (n.) Natural tendency; affinity; attraction; -- used of inanimate objects.

acrimony afflatus aim ambition anima animating spirit animation animosity antagonism antipathy appetence appetency appetite aptitude aspiration bad blood bent bias bitter feeling bitterness cast character choice command conation conatus constitution counsel decision desideration desideratum design desire determination diathesis discretion discrimination disposition divine afflatus eccentricity effect elan vital enlivenment exhilaration fancy feud fire firing fixed purpose free choice free will function genius grain grudge hard feelings hostility idea idiosyncrasy ill blood ill feeling ill will inclination individualism infection infusion inspiration intendment intent intention kidney leaning liking lust make makeup meaning mental set mettle mind mind-set mold motive moving spirit nature nisus objective passion plan pleasure pneuma point predilection predisposition preference prejudice proclivity project propensity proposal prospectus psyche purpose rancor resolution resolve sake set sexual desire slant soreness sourness spirit stamp strain streak stripe striving study temper temperament tendency turn turn of mind twist type velleity vendetta venom view virulence vital force vitriol volition warp will will power wish