im·pair

[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.
verb (used without object)
2.
to grow or become worse; lessen.
noun
3.
Archaic. impairment.

Origin:
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

im·pair·a·ble, adjective
im·pair·er, noun
im·pair·ment, noun
non·im·pair·ment, noun
pre·im·pair·ment, noun
self-im·pair·a·ble, adjective
self-im·pair·ing, adjective
un·im·pair·a·ble, adjective


1. See injure.


1. repair.
Dictionary.com Unabridged

im·pair

[an-per]
adjective French.
noting any odd number, especially in roulette.
Compare pair.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
impair (ɪmˈpɛə) [Click for IPA pronunciation guide]
 
vb
(tr) to reduce or weaken in strength, quality, etc: his hearing was impaired by an accident
 
[C14: from Old French empeirer to make worse, from Late Latin pējorāre, from Latin pejor worse; see pejorative]
 
im'pairable
 
adj
 
im'pairer
 
n
 
im'pairment
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

impair
late 14c., earlier ampayre, apeyre (c.1300), from O.Fr. empeirier, from V.L. *impejorare "make worse," from L. in- "into" + L.L. pejorare "make worse," from pejor "worse." In ref. to driving under the influence of alcohol, first recorded 1951 in Canadian Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Most people would want to edit memories that impair them.
The unremitting sweaty, sticky, airless journeys to matches every day hundreds
  of kilometers apart might impair my view.
Space officials are concerned that the loss of any more might impair the
  operation of the spacecraft.
The opening in his throat to ease his breathing should not necessarily impair
  his ability to work, the doctors said.
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