Decade

For other senses of this word, see decade (disambiguation).

A decade is a set or a group of ten, commonly a period of 10 years in contemporary English, or a period of 10 days in the French revolutionary calendar. The word is derived from the late Latin "decas", from Greek "dekas", from deka. In contemporary English, the word can be used to specify a general period of ten years, for example "The last decade was characterized by the rise of the Internet". A decade may also be a well-defined historical period of ten years in a dating system. In that sense, the first decade of the 20th century indicates a period from January 1, 1901 until December 31, 1910.

See also

• List of decades

v • d • e Time measurement and standards
Major subjects	Time · Chronometry · Orders of magnitude · Units of time · Metrology	Time Portal
International standards	UTC · UT · TAI · ISO 31-1 · Second · DUT1 · Leap second · IERS Terrestrial Time · Geocentric Coordinate Time · Barycentric Coordinate Time Civil time · Minute · Hour · 12-hour clock · 24-hour clock · ISO week date International Date Line · Solar time · Time zone · Daylight saving time · Time offset · Annum
Obsolete standards	Ephemeris time · Barycentric Dynamical Time · Greenwich Mean Time · Prime Meridian
Time in physics	Spacetime · Chronon · Cosmological decade · Planck epoch · Planck time · T-symmetry Theory of relativity · Time dilation · Gravitational time dilation · Coordinate time · Proper time Time domain · Continuous time · Discrete time · Absolute time and space
Horology	Clock · Astrarium · Atomic clock · Hourglass · Marine chronometer · Sundial · Water clock History of timekeeping devices · Equation of time · Complication
Calendar	Day · Week · Month · Year · Decade · Century · Millennium Astronomical · Julian · Gregorian · Islamic · Lunisolar · Solar · Lunar · Epact · Intercalation · Leap year Tropical year · Equinox · Solstice · Days of the week · Calculating the day of the week · Dominical letter
Archaeology & geology	International Commission on Stratigraphy · Geologic Time · Archaeological dating
Astronomical chronology	Nuclear time scale · Precession · Sidereal time · Galactic year
Unusual units	FFF System · Fortnight · Jiffy · Lustrum · Saeculum · Shake · Tide
Related topics	Chronology · Duration · Mental chronometry · Time value of money

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