Noun

1. An established custom
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
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

Verb

1. Put a habit on