Meaning

noun an established custom

noun (psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition

noun a distinctive attire worn by a member of a religious order

originFrom Middle English habit, from Latin habitus (“condition, bearing, state, appearance, dress, attire”), from habeō (“to have, hold, keep”). Distantly related to gift. Replaced Middle English abit, from Old French abit, itself from the same Latin source. Displaced native Old English þēaw, wuna, and ġewuna.

Etymology from Wiktionary, CC BY-SA 3.0