in a direction opposite to that of the normal rotation of the hands of a clock; not clockwise. Also contraclockwise; especially British, anticlockwise.

Is counterclockwise one or two words?

Your're right, hbberlin, counter-clockwise is not such a good example, because even though it may well be written with a hyphen (e.g. ) it is commonly written as one word counterclockwise.

What does it mean by the word counterclockwise?

: in a direction opposite to that in which the hands of a clock rotate as viewed from in front. Other Words from counterclockwise Example Sentences Learn More About counterclockwise.