from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To act against with equal force; counteract.
- transitive v. To compensate for; offset.
- intransitive v. To act against an often detrimental influence or power.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To have the same value as.
- v. To counteract, counterbalance or neutralize.
- v. To compensate for.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To act against with equal force, power, or effect; to thwart or overcome by such action; to furnish an equivalent to or for; to counterbalance; to compensate.
- n. Power or value sufficient to obviate any effect; equal weight, strength, or value; equivalent; compensation; requital.
from The Century Dictionary and Cyclopedia
- To act against or antagonize with equal force or power; act or avail with equivalent effect against; counteract.
- Hence To be or furnish an equivalent of or a compensation for; make good; offset.
- n. Counterbalancing power or weight sufficient to obviate or counteract any effect; equal efficacy or value; compensation; requital.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. oppose and mitigate the effects of by contrary actions
- v. compensate for or counterbalance
Middle English countrevaillen, from Old French contrevaloir, contrevail- : contre-, counter- + valoir, to be worth (from Latin valēre, to be strong; see wal- in Indo-European roots).(American Heritage® Dictionary of the English Language, Fourth Edition)
From Anglo-Norman countrevaloir ( = Old French contrevaloir), from Latin contrā valēre ("to be worth against"). (Wiktionary)