Source : WordNet®

counterclockwise
     adj : in the direction opposite to the rotation of the hands of a
           clock [syn: {anticlockwise}, {contraclockwise}] [ant: {clockwise}]
     adv : in a direction opposite to the direction in which the hands
           of a clock move; "please move counterclockwise in a
           circle!" [syn: {anticlockwise}] [ant: {clockwise}]