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[koun-ter-klok-wahyz] /ˌkaʊn tərˈklɒkˌwaɪz/
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.
Origin of counterclockwise
First recorded in 1885-90; counter- + clockwise Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for counterclockwise


adverb, adjective
(US & Canadian) in the opposite direction to the rotation of the hands of a clock Also called (in Britain and certain other countries) anticlockwise
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for counterclockwise
adj., adv.

1870, also counter-clockwise; from counter- + clockwise.

Online Etymology Dictionary, © 2010 Douglas Harper
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