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plural decads
Archaic form of decade (“period of ten years”). quotations examples
Since Averill was a decad and a half / His elder, and their parents underground
1864, Alfred Tennyson, “Aylmer’s Field”, in Enoch Arden, &c., London: Edward Moxon & Co., […], page 55
Archaic form of decade (“group of ten”). quotations examples
Plato […] extends number as far as to the decad.
1806, Aristotle, translated by Thomas Taylor, The Physics, or Physical Ausculation of Aristotle, page 167
(music) A group of ten notes from which the consonant triads may be constructed examples