What is the meaning of Decade?

A group, set, or series of ten , particularly:

A period of ten years , particularly such a period beginning with a year ending in 0 and ending with a year ending in 9.

A period of ten days, particularly those in the ancient Egyptian, Coptic, and French Revolutionary calendars.

A work in ten parts or books, particularly such divisions of Livy's History of Rome.

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.

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

A set of ten electronic devices used to represent digits.

A set of resistors, capacitors, etc. connected so as to provide even increments between one and ten times a base electrical resistance.

The interval between any two quantities having a ratio of 10 to 1.

a décade, 'week' of ten days in the French republican calendar; hence any ten consecutive days

a set of ten book volumes, as part of a larger opus

a decade, period of ten years

a decade, a period of ten days

third-person singular present indicative of decadere

ablative singular of decās

a series of 10 books

third-person singular present indicative of decădea

Source: wiktionary.org