decad
noun/ˈdɛkæd/
Etymology Doublet of decade and dekad. By surface analysis, dec- + -ad.
1
Archaic Archaic form of decade (“period of ten years”).
- Since Averill was a decad and a half / His elder, and their parents underground1864, Alfred Tennyson, “Aylmer’s Field”, in Enoch Arden, &c., London: Edward Moxon & Co., […], →OCLC, page 55:
2
Archaic Archaic form of decade (“group of ten”).
- Plato […] extends number as far as to the decad.1806, Aristotle, translated by Thomas Taylor, The Physics, or Physical Ausculation of Aristotle, page 167:
3
Entertainment, Lifestyle, Music A group of ten notes from which the consonant triads may be constructed
- Derived terms
- heptadecad