- a group of ten
- a period of ten years; esp., in the Gregorian calendar
- officially a ten-year period beginning with the year 1, as 1921-1930, 1931-1940, etc.
- in common usage, a ten-year period beginning with a year 0, as 1920-1929, 1930-1939, etc.
- a division of the rosary consisting of one large bead and ten small beads
Origin of decadeLate Middle English from Old French from Late Latin decas (gen. decadis) from Classical Greek dekas from deka, ten
- A period of ten years.
- A group or series of ten.
Origin of decadeMiddle English a group of ten from Old French from Late Latin decas decad- from Greek dekas from deka ten ; see dek&mlowring; in Indo-European roots.
- A series or group of ten things. [from 16th c.]
- a decade of soldiers
- A period of ten years. [from 17th c.]
- (French history) In the French Revolutionary calendar, a group of ten days. [from 18th c.]
- (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.
It is sometimes but very rarely claimed that decades run from xx01-xx10 instead of the usual xx00-xx09. Be aware lest confusion arise from this.
From Middle English, from Middle French decade, from Late Latin decas (“(set of) ten”), from Ancient Greek δέκας (dékas), from δέκα (déka, “ten”).