decade

noun

de·​cade ˈde-ˌkād 

de-ˈkād;

 especially sense 1b  ˈde-kəd

1

: a group or set of 10

his prisoners were divided into decades

—William Godwin

: 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

Seven decades later, these ideas are mainstream in both Israeli and US discourse. —Literary Hub, 3 Nov. 2025

Vietnam’s Communist Party chief, To Lam, visited North Korea in early October — the first such trip in nearly two decades — while reports suggest Hanoi may pursue the purchase of 40 Russian Su-35 fighter jets. —Sasha Rogelberg, Fortune, 3 Nov. 2025

With hundreds of miles of trails for hiking, mountain biking, and horseback riding, plus cerulean lakes for canoeing and kayaking, Kananaskis has been Alberta’s outdoor playground for decades. —Lisa Kadane, Travel + Leisure, 2 Nov. 2025

The most notable failure of the Nigerian government is that successive administrations have in over a decade and a half been unable to end the scourge of Boko Haram and other Islamist or related terrorist groups that have indeed killed thousands of Christians. —Yinka Adegoke, semafor.com, 2 Nov. 2025

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

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