decade

noun

de·​cade ˈde-ˌkād 

de-ˈkād;

especially sense 1b ˈde-kəd

1

: a group or set of 10

It isn't to be done in a day of course, nor yet in a century, —nor in a decade of centuries …

—Anthony Trollope

: such as

a

: 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

decadal

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.

Recent Examples on the Web

Panettiere said she was fired from a decade-plus brand deal with Neutrogena after speaking out about postpartum depression in a 2015 interview on national TV. — Lauren Mascarenhas, CNN Money, 23 Aug. 2026

Though Sex and the City ended two entire decades ago, many of her most valuable life lessons—usually delivered via purring, zingy one-liners, either with a dirty martini in one hand or while waving a fork over brunch—feel just as relevant today. — Daisy Jones, Vogue, 22 Aug. 2026

For three decades, the cartoon superhero has endeared himself to generations — including Isbel’s son, Lane. — Kansas City Star, 22 Aug. 2026

The end goal is to not only recover nuclear fuel and isotopes, but to quickly reduce the US waste stockpile in decades rather than eons. — David Szondy august 22, New Atlas, 22 Aug. 2026

Word History

Etymology

Middle English, from Middle French décade, from Late Latin decad-, decas, from Greek dekad-, dekas, from deka — see deca-

First Known Use

15th century, in the meaning defined at sense 1

Phrases Containing decade

• decade-long
• mid-decade redistricting

Rhymes for decade

• afraid
• allayed
• arcade
• arrayed
• assayed
• barmaid
• betrayed
• blockade
• bridesmaid
• brigade
• brocade
• buffeted

Kids Definition

decade

noun

de·​cade ˈdek-ˌād 

-əd;

de-ˈkād;

sense 3 is usually ˈdek-əd

1

: a group or set of 10

2

: a period of 10 years

3

: a part of the rosary made up mainly of 10 Hail Marys