1.The usual condition or state of a person or thing, either natural or acquired, regarded as something had, possessed, and firmly retained; as, a religious habit; his habit is morose; elms have a spreading habit; esp., physical temperament or constitution; as, a full habit of body.
2.(Biol.) The general appearance and manner of life of a living organism. Specifically, the tendency of a plant or animal to grow in a certain way; as, the deciduous habit of certain trees.
3.Fixed or established custom; ordinary course of conduct; practice; usage; hence, prominently, the involuntary tendency or aptitude to perform certain actions which is acquired by their frequent repetition; as, habit is second nature; also, peculiar ways of acting; characteristic forms of behavior. "A man of very shy, retired habits."
4.Outward appearance; attire; dress; hence, a garment; esp., a closely fitting garment or dress worn by ladies; as, a riding habit. "Costly thy habit as thy purse can buy." "There are, among the statues, several of Venus, in different habits."
5.Hence: The distinctive clothing worn commonly by nuns or monks; as, in the late 1900's many orders of nuns discarded their habits and began to dress as ordinary lay women.