She was so nervous to see her high school sweetheart at their reunion: it had been a decade (ten years) since she'd seen him at graduation, and she still got butterflies thinking about him.

A decade is a period of ten years. Decade contains dec, which is used in words that have to do with tens. The Marty Paich Dectet was a band with ten players. A decahedron is a shape with ten faces. And the decimal system is based on the number ten.

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n a period of 10 years

Synonyms:
decennary, decennium
Types:
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1900s
the decade from 1900 to 1909
1530s
the decade from 1530 to 1539
1920s, twenties
the decade from 1920 to 1929
1820s
the decade from 1820 to 1829
1930s, thirties
the decade from 1930 to 1939
1830s
the decade from 1830 to 1839
1940s, forties
the decade from 1940 to 1949
1840s
the decade from 1840 to 1849
1950s, fifties
the decade from 1950 to 1959
1850s
the decade from 1850 to 1859
1750s
the decade from 1750 to 1759
1960s, sixties
the decade from 1960 to 1969
1860s
the decade from 1860 to 1869
1760s
the decade from 1760 to 1769
1970s, seventies
the decade from 1970 to 1979
1870s
the decade from 1870 to 1879
1770s
the decade from 1770 to 1779
1980s, eighties
the decade from 1980 to 1989
1880s, eighties
the decade from 1880 to 1889
1780s
the decade from 1780 to 1789
1990s, nineties
the decade from 1990 to 1999
1890s, nineties
the decade from 1890 to 1899
1790s
the decade from 1790 to 1799
Type of:
period, period of time, time period
an amount of time

n the cardinal number that is the sum of nine and one; the base of the decimal system

Synonyms:
10, X, ten, tenner
Type of:
large integer
an integer equal to or greater than ten