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

1885–90; counter- + clockwise Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
counterclockwise or contraclockwise (ˌkaʊntəˈklɒkˌwaɪz)
adv, —adj
(US), (Canadian) Also called (in Britain and certain other countries): anticlockwise in the opposite direction to the rotation of the hands of a clock
contraclockwise or contraclockwise
adv, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1870, also counter-clockwise; from counter- + clockwise (see clock).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Mom was the real handyman in our household, because she knew the difference
  between clockwise and counterclockwise.
When faced with the rare snail whose shell formation is counterclockwise, many
  snakes failed to feed or dropped their prey.
With my back to the right wall of the chamber, turning my head to the left
  makes the interior twist counterclockwise.
With my back to the left wall, a right turn tips it counterclockwise, while a
  left turn tips it clockwise.
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