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n.1.The act of retarding; retardation.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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At the mental exam, he presented poor hygiene, disheveled hair, unshaven, and passive posture, he was self-referential, alert, with hypoprosexia, oriented, he had seriously depressed humor, intense psychomotor retardment, and very slowly thinking and with many blocks.