Decade

A decade (pronounce: DEK-aid) is a period of 10 years. The word comes from the Ancient Greek word for ten: "deka". 10 decades make a century, while 100 decades make a millennium. A decade is any 10 year period: There are different ways to refer to different groupings of ten years. For example, the period from 2001 to 2010 can be described as the 1st decade of the 21st century. An individual who has been alive two full decades is referred to as being in their 20s for the next decade of their life, from age 20 to 29. Decades are also considered specific groups of ten years sharing the same tens digit, identified by name, as in the nineteen-eighties (1980s) referring to the period from 1980 to 1989 and the nineteen-nineties (1990s) referring to the period from 1990 to 1999. This is the sense meant when someone refers to decades without other context, for example saying 'next decade' in any year between 2020 and 2029 would indicate the 2030s. Sometimes this is shortened to just the decade, where the context is clear, as in the eighties (80s) or the nineties (90s). No apostrophe is used before the s in the names of these decades.

Some decades also have nicknames, such as the Roaring Twenties (1920s), the Gay Nineties (1890s) (US), the Naughty Nineties (1890s) (UK), and the Swinging Sixties (1960s).

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3rd century	200s	210s	220s	230s	240s	250s	260s	270s	280s	290s
4th century	300s	310s	320s	330s	340s	350s	360s	370s	380s	390s
5th century	400s	410s	420s	430s	440s	450s	460s	470s	480s	490s
6th century	500s	510s	520s	530s	540s	550s	560s	570s	580s	590s
7th century	600s	610s	620s	630s	640s	650s	660s	670s	680s	690s
8th century	700s	710s	720s	730s	740s	750s	760s	770s	780s	790s
9th century	800s	810s	820s	830s	840s	850s	860s	870s	880s	890s
10th century	900s	910s	920s	930s	940s	950s	960s	970s	980s	990s
11th century	1000s	1010s	1020s	1030s	1040s	1050s	1060s	1070s	1080s	1090s
12th century	1100s	1110s	1120s	1130s	1140s	1150s	1160s	1170s	1180s	1190s
13th century	1200s	1210s	1220s	1230s	1240s	1250s	1260s	1270s	1280s	1290s
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20th century	1900s	1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s
21st century	2000s	2010s	2020s	2030s	2040s	2050s	2060s	2070s	2080s	2090s