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
3 a : 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