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Definition of decennium : A period of ten years.

Synonyms:

tenner, ten, decennary

five or more (part of speech: noun)

hundred, septuple, octavo, jillion, billion, octet, octagon, hundredfold, grand, fourscore, teens, sextuple, score, trillion, dozen, gross, million, hexad, sevenfold, thousand, sixfold, duodecimo, decade, octave

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