Pronunciation: (dek'ād; Brit. also du-kād'), [key]
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.