Decade Definition

dĕkād, dĕ-kād

decades

noun

decades

A period of ten years; esp., in the Gregorian calendar.

Webster's New World

A group of ten.

Webster's New World

A division of the rosary consisting of one large bead and ten small beads.

Webster's New World

(physics, engineering) The interval between any two quantities having the ratio 10 to 1.

There are decades between 1.8 and 18, between 25 and 250 and between 0.03 and 0.003.

Wiktionary

Synonyms:

Other Word Forms of Decade

Singular:

decade

Plural:

decades

Middle English a group of ten from Old French from Late Latin decas decad- from Greek dekas from deka ten dekm̥ in Indo-European roots

From American Heritage Dictionary of the English Language, 5th Edition
From Middle English, from Middle French decade, from Late Latin decas (“(set of) ten”), from Ancient Greek δέκας (dékas), from δέκα (déka, “ten”).

From Wiktionary