Definition of decade
1 : a group or set of 10 <his prisoners were divided into decades — William Godwin>: such asa : a period of 10 years <has been teaching for over a decade> <the decade of the twenties>b Roman Catholicism : a division of the rosary that consists primarily of 10 Hail Marys
2 mathematics : a ratio of 10 to 1 : order of magnitude
decadalplay \ˈde-kə-dəl\ adjective
Examples of decade in a sentence
The war lasted nearly a decade.
The bridge was built a decade ago.
The decade of the 1920s runs from January 1, 1920 to December 31, 1929.
the first decade of the 21st century
There have been a lot of changes during the past two decades.
Origin and Etymology of decade
Middle English, from Medieval French décade, from Late Latin decad-, decas, from Greek dekad-, dekas, from deka —see deca-
First Known Use: 15th century
DECADE Defined for English Language Learners
Definition of decade for English Language Learners
: a period of 10 years; especially : a 10-year period beginning with a year ending in 0
DECADE Defined for Kids
Definition of decade for Students
: a period of ten years
Seen and Heard
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