Definition of "Habit" :

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

"Owls have nocturnal habits."

noun: excessive use of drugs

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

noun: attire that is typically worn by a horseback rider (especially a woman's attire)

noun: an established custom

"It was their habit to dine at 7 every evening."

noun: the general form or mode of growth (especially of a plant or crystal)

"A shrub of spreading habit."

verb: put a habit on