English dictionary decade meaning and definition Definition and meaning of decade at MeaningMonkey.org. decade meaning and definition in the English Dictionary. DECADE nounDefinition of decade (noun)a period of 10 yearssynonyms: decennary, decenniumthe cardinal number that is the sum of nine and one; the base of the decimal systemsynonyms: 10, ten, tenner, X Source: Princeton University Wordnet
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