- a period of ten years: the three decades from 1776 to 1806.
- a period of ten years beginning with a year whose last digit is zero: the decade of the 1980s.
- a group, set, or series of ten.
Origin of decade
Examples from the Web for half-decade
There have been attempts to excavate the remains, and many have been removed over the past half-decade.A WWII Battle Frozen in Time
May 14, 2014
Because of his constant globe-trotting, Addington's slang was often a half-decade behind the times.Angel Island
Inez Haynes Gillmore
- a period of ten consecutive years
- a group or series of ten
Word Origin and History for half-decade
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.