habit

noun

1.
an established custom
Derived from:
habituate
2.
(psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition
3.
a distinctive attire worn by a member of a religious order
Derived from:
habit
4.
the general form or mode of growth (especially of a plant or crystal)
5.
attire that is typically worn by a horseback rider (especially a woman's attire)
6.
excessive use of drugs
Derived from:
habituate