decennium decennially • decennoval · · · Info · Definitions · Synonyms · Characters · · decennium · · Text Latin · · Script 9 · · Length Definitions · · · (noun) a period of 10 years. Synonyms: decade, decennary. · · Noun Definition 1 Synonyms · · · decade · · Synonym 1 decennary · · Synonym 2 Characters · · c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E u latin small letter u U+0075