Usually Offensive. slowness or limitation in intellectual understanding and awareness, emotional development, academic progress, etc.See also mental retardation.
Music. a form of suspension that is resolved upward.
Also re·tard·ment[ri-tahrd-muh nt]/rɪˈtɑrd mənt/.
Origin of retardation
1400–50;late Middle Englishretardacioun < Latinretardātiōn- (stem of retardātiō), equivalent to retardāt(us) (see retard, -ate1) + -iōn--ion
Related formsre·tard·a·tive[ri-tahr-duh-tiv]/rɪˈtɑr də tɪv/, re·tard·a·to·ry[ri-tahr-duh-tawr-ee, -tohr-ee]/rɪˈtɑr dəˌtɔr i, -ˌtoʊr i/, adjectivenon·re·tar·da·tion, nounnon·re·tard·a·tive, adjectivenon·re·tard·a·to·ry, adjectivenon·re·tard·ment, noun
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.