Source : Webster's Revised Unabridged Dictionary (1913)

Clockwise \Clock"wise`\, a. & adv.
   Like the motion of the hands of a clock; -- said of that
   direction of a rotation about an axis, or about a point in a
   plane, which is ordinarily reckoned negative.

Source : WordNet®

clockwise
     adj : in the same direction as the rotating hands of a clock [ant:
            {counterclockwise}]
     adv : in the direction that the hands of a clock move; "please
           move clockwise in a circle" [ant: {counterclockwise}]