World English Dictionary
1.  against; contrary; opposing; contrasting: contraceptive; contradistinction
2.  (in music) pitched below: contrabass
[from Latin, from contrā against]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

prefix meaning "against," from L. adverb and preposition contra (see contra). The L. word was used as a prefix in Late Latin. in French, it became contre- and passed into Eng. as counter-. The O.E. equivalent was wiðer (surviving in withers and widdershins), from wið "with, against."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

contra- pref.
Against; opposite; contrasting: contraindication.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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