Retardation; delay. / (music) A slowing down of the tempo; a ritardando. / (offensive, dated) A person with mental retardation.

(transitive) To keep delaying; to continue to hinder; to prevent from progressing. / (transitive) To put off; to postpone. / (transitive, obsolete) To be slow or dilatory to perform (something).

Of or pertaining to retardations.

Capable of being retarded, or delayed.

(physics) The difference in phase shift between two characteristic polarizations of light upon reflection from an interface. Retardance can be reported in the Abelès or Mueller conventions. The retardance phase shift angle is often specified in degrees.

Delayed; delayed in development, hindered; impeded. / (psychology, now offensive, dated) Having mental retardation; mentally deficient or underdeveloped.

simple past tense and past participle of retard

present participle of retard

A slowing or hindrance.

plural of retard