Etymology
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decade (n.)

mid-15c., "ten parts" (of anything; originally in reference to the divisions of Livy's history), from Old French décade (14c.), from Late Latin decadem (nominative decas), from Greek dekas (genitive dekados) "group of ten," from deka "ten" (from PIE root *dekm- "ten"). Meaning "period of ten consecutive years" is 1590s in English. Related: Decadal; decadary.

updated on July 05, 2018

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Definitions of decade from WordNet

decade (n.)
a period of 10 years;
Synonyms: decennary / decennium
decade (n.)
the cardinal number that is the sum of nine and one; the base of the decimal system;
Synonyms: ten / " / x / tenner
From wordnet.princeton.edu, not affiliated with etymonline.