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countervail

[koun-ter-veyl] /ˌkaʊn tərˈveɪl/
verb (used with object)
1.
to act or avail against with equal power, force, or effect; counteract.
2.
to furnish an equivalent of or a compensation for; offset.
3.
Archaic. to equal.
verb (used without object)
4.
to be of equal force in opposition; avail.
Origin
1350-1400
1350-1400; Middle English contrevailen < Anglo-French countrevail-, tonic stem (subjunctive) of countrevaloir to equal, be comparable to < Latin phrase contrā valēre to be of worth against (someone or something). See counter-, -valent
Related forms
uncountervailed, adjective
Synonyms
1. counterbalance, counterpoise, neutralize.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for counter-vail

countervail

/ˌkaʊntəˈveɪl; ˈkaʊntəˌveɪl/
verb
1.
when intr, usually foll by against. to act or act against with equal power or force
2.
(transitive) to make up for; compensate; offset
Word Origin
C14: from Old French contrevaloir, from Latin contrā valēre, from contrā against + valēre to be strong
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for counter-vail

countervail

v.

late 14c., "to be worth as much as," also "to prevail against," from Anglo-French countrevaloir, Old French contrevaloir "to be effective against, be comparable to," from Latin phrase contra valere "to be worth against" (see contra- and valiant). Related: Countervailing.

Online Etymology Dictionary, © 2010 Douglas Harper
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9
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