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decade (n.)

mid-15c., "ten parts" (of anything; originally in reference to the divisions of Livy's history), from Old French décade (14c.), from Late Latin decadem (nominative decas), from Greek dekas (genitive dekados) "group of ten," from deka "ten" (from PIE root *dekm- "ten"). Meaning "period of ten consecutive years" is 1590s in English. Related: Decadal; decadary.

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*dekm- 

Proto-Indo-European root meaning "ten."

It forms all or part of: cent; centenarian; centenary; centi-; centime; centurion; century; centennial; cinquecento; dean; deca-; decade; decagon; Decalogue; Decameron; decapod; decathlon; December; decennial; deci-; decile; decimal; decimate; decimation; decuple; decussate; denarius; denier (n.) "French coin;" dicker; dime; dinar; doyen; dozen; duodecimal; duodecimo; eighteen; fifteen; fourteen; hecatomb; hendeca-; hundred; icosahedron; nineteen; nonagenarian; octogenarian; Pentecost; percent; quattrocento; Septuagint; sexagenarian; seventeen; sixteen; ten; tenth; thirteen; thousand; tithe.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dasa, Avestan dasa, Armenian tasn, Greek deka, Latin decem (source of Spanish diez, French dix), Old Church Slavonic deseti, Lithuanian dešimt, Old Irish deich, Breton dek, Welsh deg, Albanian djetu, Old English ten, Old High German zehan, Gothic taihun "ten."

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twenties (n.)
1829 as the years of someone's life between 20 and 29; 1830 as the third decade of years in a given century. See twenty.
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fifties (n.)
1826 as the years of someone's life between 50 and 59; 1853 as the sixth decade of years in a given century. See fifty.
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seventies (n.)
1859 as the years of someone's life between 70 and 79; from 1837 as the eighth decade of years in a given century. See seventy.
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thirties (n.)
1827 as the years of someone's life between 30 and 39; 1830 as the fourth decade of years in a given century. See thirty.
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teens (n.)
1670s (plural), "teen-age years of a person," formed from -teen taken as a separate word. As "decade of years comprising numbers ending in -teen," from 1889.
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sixties (n.)
1848 as the years of someone's life between 60 and 69; 1827 as the seventh decade of years in a given century. See sixty.
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eighties (n.)
1827 as the years of someone's life between ages 80 and 89; from 1833 as the ninth decade of years in a given century; from 1854 with reference to Fahrenheit temperature. See eighty.
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Harlem 
Manhattan district, used figuratively for "African-American culture" by 1925. The N.Y. community was founded 1658 and originally named Nieuw Haarlem for Haarlem in Netherlands, which probably is from Dutch haar "height" + lem "silt," in reference to its position on a slight elevation on the banks of the Spaarne River. The black population grew rapidly in the decade after World War I. Related: Harlemese.
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