Noun

(en noun)

A series or group of ten things.

a decade of soldiers

A period of ten years.

*

The repeated exposure, over decades , to most taxa here treated has resulted in repeated modifications of both diagnoses and discussions, as initial ideas of the various taxa underwent—often repeated—conceptual modification.

* {{quote-magazine

, year=1979 , date=December , title=Museums , magazine=Texas Monthly , volume=7 , issue=12 , page=22 citation , passage=Thru May: 1920s — The Decade That Roared. New exhibition portraying historical events and everyday life during the Roaring Twenties.}}

* {{quote-magazine, date=2013-03

, author=David S. Senchina , title=Athletics and Herbal Supplements , volume=101, issue=2, page=134 , magazine=(American Scientist) citation , passage=Athletes' use of herbal supplements has skyrocketed in the past two decades .}}

* 2002 , , The Great Nation , Penguin 2003, p. 481:

The year was divided up into twelve months renamed after the seasons [...]; each month comprised three ‘decades ’ of ten days – with the décadi replacing Sundays as a day of rest; and each day was reconsecrated to a natural product or farming tool or technique.

(Roman Catholicism) A series of ten Hail Marys in the rosary.

(physics, engineering) The interval between any two quantities having the ratio 10 to 1.

There are decades between 1.8 and 18, between 25 and 250 and between 0.03 and 0.003.

Noun

A state of moral or artistic decline or deterioration; decay

* 1956 — , The City and the Stars , p 35

"Stability, however, is not enough. It leads too easily to stagnation, and thence to decadence ."