half-decade

decade

[dek-eyd; British also duh-keyd]
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:
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

half-decade, noun
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World English Dictionary
decade (ˈdɛkeɪd, dɪˈkeɪd)
 
n
1.  a period of ten consecutive years
2.  a group or series of ten
 
[C15: from Old French, from Late Latin decad-, decas, from Greek dekas, from deka ten]
 
de'cadal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

decade
mid-15c., "ten parts" (of anything; originally in ref. to the books of Livy), from M.Fr. decade, from L.L. decadem (nom. decas), from Gk. dekas (acc. dekada) "group of ten." Meaning "ten years" is 1590s in English.
Online Etymology Dictionary, © 2010 Douglas Harper
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