Source : Webster's Revised Unabridged Dictionary (1913)

Habitual \Ha*bit"ual\ (?; 135), a. [Cf. F. habituel, LL.
   habituals. See {Habit}, n.]
   1. Formed or acquired by habit or use.

            An habitual knowledge of certain rules and maxims.
                                                  --South.

   2. According to habit; established by habit; customary;
      constant; as, the habiual practice of sin.

            It is the distinguishing mark of habitual piety to
            be grateful for the most common and ordinary
            blessings.                            --Buckminster.

   Syn: Customary; accustomed; usual; common; wonted; ordinary;
        regular; familiar. -- {Ha*bit"u*al*ly}, adv. --
        {Ha*bit"u*al*ness}, n.

Source : WordNet®

habitual
     adj 1: made a norm or custom or habit; "his habitual practice was
            to eat an early supper"; "her habitual neatness"
     2: commonly used or practiced; usual; "his accustomed
        thoroughness"; "took his customary morning walk"; "his
        habitual comment"; "with her wonted candor" [syn: {accustomed},
         {customary}, {wonted(a)}]
     3: having a habit of long standing; "a chronic smoker" [syn: {chronic},
         {confirmed}, {inveterate(a)}]