Medical Definition of habit
1: bodily appearance or makeup especially as indicative of one's capacities and condition <a man of fleshy habit>
2: a settled tendency or usual manner of behavior
3a: a behavior pattern acquired by frequent repetition or physiological exposure that shows itself in regularity or increased facility of performance <the daily bowel habit>b: an acquired mode of behavior that has become nearly or completely involuntary <locked the door through force of habit>c: addiction <was forced to steal to support his drug habit>
4: characteristic mode of growth or occurrence
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