counterpoise

From Old French contrepois, contrepeser, later assimilated to poise.

• IPA^(key): /ˈkaʊntə(ɹ)ˌpɔɪz/

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counterpoise (plural counterpoises)

1. A weight sufficient to balance another, for example in the opposite end of scales; an equal weight.
2. An effect of equal power or force acting in opposition; a force sufficient to balance another force or influence
   • 1838 (date written), L[etitia] E[lizabeth] L[andon], chapter XVI, in Lady Anne Granard; or, Keeping up Appearances. , volume I, London: Henry Colburn, , published 1842, →OCLC, page 200:

     This necessary counterpoise, the affectionate and simple-minded will readily conceive, would arise to Louisa from the absence of those "dear familiar faces" which had hitherto constituted her world.

3. The relation of two weights or forces which balance each other; equilibrium

   Synonym: equiponderance

• counterpoise-lift

counterpoise (third-person singular simple present counterpoises, present participle counterpoising, simple past and past participle counterpoised)

1. To act against with equal weight; to equal in weight; to balance the weight of; to counterbalance.
   • 1644, Kenelm Digby, Two Treatises:

     Weights, counterpoising one another.

2. To act against with equal power; to balance.
   • 1596 (date written; published 1633), Edmund Spenser, A Vewe of the Present State of Irelande , Dublin: Societie of Stationers, , →OCLC; republished as A View of the State of Ireland  (Ancient Irish Histories), Dublin: Society of Stationers, Hibernia Press, y John Morrison, 1809, →OCLC:

     So many freeholders of English […] will be able to beard, and to counterpoise the rest.