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decade

[dek-eyd; British also duh-keyd] /ˈdɛk eɪd; British also dəˈkeɪd/
noun
1.
a period of ten years:
the three decades from 1776 to 1806.
2.
a period of ten years beginning with a year whose last digit is zero:
the decade of the 1980s.
3.
a group, set, or series of ten.
Origin
late Middle English
1425-1475
1425-75; late Middle English < Middle French < Late Latin decad- (stem of decas) < Greek dekad- (stem of dekás) group of ten, equivalent to dék(a) ten + -ad- -ade2
Related forms
half-decade, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for halfdecade

decade

/ˈdɛkeɪd; dɪˈkeɪd/
noun
1.
a period of ten consecutive years
2.
a group or series of ten
Derived Forms
decadal, adjective
Word Origin
C15: from Old French, from Late Latin decad-, decas, from Greek dekas, from deka ten
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for halfdecade

decade

n.

mid-15c., "ten parts" (of anything; originally in reference to the books of Livy), from Middle French décade (14c.), from Late Latin decadem (nominative decas), from Greek dekas (genitive dekados) "group of ten," from deka "ten" (see ten). Meaning "period of ten years" is 1590s in English.

Online Etymology Dictionary, © 2010 Douglas Harper
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