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impair1

[im-pair]
verb (used with object)
  1. to make or cause to become worse; diminish in ability, value, excellence, etc.; weaken or damage: to impair one's health; to impair negotiations.
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verb (used without object)
  1. to grow or become worse; lessen.
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noun
  1. Archaic. impairment.
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Origin of impair1

1250–1300; Middle English empairen, empeiren to make worse < Middle French empeirer, equivalent to em- im-1 + peirer to make worse < Late Latin pējōrāre, equivalent to Latin pējōr-, stem of pējor worse + -ā- thematic vowel + -re infinitive suffix; cf. pejorative
Related formsim·pair·a·ble, adjectiveim·pair·er, nounim·pair·ment, nounnon·im·pair·ment, nounpre·im·pair·ment, nounself-im·pair·a·ble, adjectiveself-im·pair·ing, adjectiveun·im·pair·a·ble, adjective

Synonyms

1. See injure.

Antonyms

1. repair.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-impairment

impair

verb
  1. (tr) to reduce or weaken in strength, quality, etchis hearing was impaired by an accident
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Derived Formsimpairable, adjectiveimpairer, nounimpairment, noun

Word Origin

C14: from Old French empeirer to make worse, from Late Latin pējorāre, from Latin pejor worse; see pejorative
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

Word Origin and History for non-impairment

impair

v.

late 14c., earlier ampayre, apeyre (c.1300), from Old French empeirier (Modern French empirer), from Vulgar Latin *impeiorare "make worse," from assimilated form of in- "into, in" (see in- (2)) + Late Latin peiorare "make worse" (see pejorative). In reference to driving under the influence of alcohol, first recorded 1951 in Canadian English. Related: Impaired; impairing.

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Online Etymology Dictionary, © 2010 Douglas Harper