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What do a.m. and p.m. stand for?

impaired

[im-paird] /ɪmˈpɛərd/
adjective
1.
weakened, diminished, or damaged:
impaired hearing; to rebuild an impaired bridge.
2.
functioning poorly or inadequately:
Consumption of alcohol results in an impaired driver.
3.
deficient or incompetent (usually preceded by an adverb or noun):
morally impaired; sports-impaired.
Origin of impaired
impair + -ed2
Related forms
unimpaired, adjective

impair

[im-pair] /ɪmˈpɛər/
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
Related forms
impairable, adjective
impairer, noun
impairment, noun
nonimpairment, noun
preimpairment, noun
self-impairable, adjective
self-impairing, adjective
unimpairable, adjective
Synonyms
1. See injure.
Antonyms
1. repair.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for impaired

impair

/ɪmˈpɛə/
verb
1.
(transitive) to reduce or weaken in strength, quality, etc: his hearing was impaired by an accident
Derived Forms
impairable, adjective
impairer, noun
impairment, 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
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Word Origin and History for impaired

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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