decade decadation • decadence · · · Info · Definitions · Synonyms · Characters · · decade · · Text Latin · · Script 6 · · Length Definitions · · · (noun) a period of 10 years. Synonyms: decennary, decennium. · · Noun Definition 1 (noun) the cardinal number that is the sum of nine and one; the base of the decimal system. Synonyms: ten, 10, X, tenner. · · Noun Definition 2 Synonyms · · · decennary · · Synonym 1 decennium · · Synonym 2 ten · · Synonym 3 10 · · Synonym 4 x · · Synonym 5 tenner · · Synonym 6 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065