motive

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

     adj 1: causing or able to cause motion; "a motive force"; "motive
            power"; "motor energy" [syn: motive(a), motor]
     2: impelling to action; "it may well be that ethical language
        has primarily a motivative function"- Arthur Pap; "motive
        pleas"; "motivating arguments" [syn: motivative(a), motive(a),
         motivating]
     n 1: the psychological feature that arouses an organism to
          action; the reason for the action; "we did not
          understand his motivation"; "he acted with the best of
          motives" [syn: motivation, need]
     2: a theme that is elaborated on in a piece of music [syn: motif]