habit

habit (http://definr.com/habit)

     n 1: an established custom; "it was their habit to dine at 7
          every evening" [syn: wont]
     2: a pattern of behavior acquired through frequent repetition;
        "she had a habit twirling the ends of her hair"; "long use
        had hardened him to it" [syn: use, wont]
     3: a distinctive attire (as the costume of a religious order)
     4: excessive use of drugs [syn: substance abuse, drug abuse]
     v : put a habit on