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Retard (v. t.) To keep delaying; to continue to hinder; to prevent from progress; to render more slow in progress; to impede; to hinder; as, to retard the march of an army; to retard the motion of a ship; -- opposed to accelerate.
Retard (v. t.) To put off; to postpone; as, to retard the attacks of old age; to retard a rupture between nations.
Retard (v. i.) To stay back.
Retard (n.) Retardation; delay.