Anti-clockwise is most commonly used synonym for counterclockwise, which refers to the direction opposite to the rotation of the clock hands. In addition to anti-clockwise, there are several other synonyms that can be used interchangeably, such as counter-clockwise, counterclockwise, anticlockwise, and widdershins. The term counter-clockwise is often used in North America, while anticlockwise is commonly used in the United Kingdom and other Commonwealth countries. Other less common synonyms include contraclockwise, contra-clockwise, and counterclock, but these are not widely used. Regardless of which synonym you use, they all refer to the same direction, which can be useful for describing the rotation of an object or the movement of people or animals around a circle.