retardation

[ ree-tahr-dey-shuh n ]SEE DEFINITION OF retardation
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

early 15c., "fact or action of making slower in movement or time," from Latin retardationem (nominative retardatio) "a delaying," noun of action from past participle stem of retardare "to make slow, delay, keep back, hinder," from re- (see re-), + tardare "to slow" (see tardy). Sense of "educational slowness" is from 1907.

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.