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A decade. Averill was a decad and a half his elder. Tennyson.

Pertaining to ten; consisting of tens.

A group or division of ten; esp., a period of ten years; a decennium; as, a decade of years or days; a decade of soldiers; the second decade of Livy. [Written also decad.] During this notable decade of years. Gladstone.

away; decay; deterioration; declension. "The old castle, where the family lived in their decadence.' Sir W. Scott.

Decaying; deteriorating.

A writer of a book divided into decades; as, Livy was a decadist. [R.]

ditional days for festivals, and every fourth year six. Each month was divided into three decades of ten days each, the week being abolished. The names of the months in their order were, Vendémiaire, Brumaire, Frimaire Nivose, Pluviose, Ventose, Germinal, Floréal, Prairial, Messidor, Thermidor (sometimes called Fervido…