Dictionary  dec•adePronunciation: (dek'ād; Brit. also du-kād'), [key] —n. 1. a period of ten years: the three decades from 1776 to 1806. 2. a period of ten years beginning with a year whose last digit is zero: the decade of the 1980s. 3. a group, set, or series of ten. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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