decade

decennium, årtionde, dekad

1. A period of ten years [from 17th c.], particularly such a period beginning with a year ending in 0 and ending with a year ending in 9. [from 19th c.]

2. (Roman Catholicism) A series of prayers counted on a rosary, typically consisting of an Our Father, followed by ten Hail Marys, and concluding with a Glory Be and sometimes the Fatima Prayer.

3. A group, set, or series of ten [from 16th c.], particularly:

4. Any of the sets of ten sequential braille characters with predictable patterns.