- A set of two different elements.
- 1924: ARISTOTLE. Metaphysics. Translated by W. D. Ross. Nashotah, Wisconsin, USA: The Classical Library, 2001. Available at: <http://www.classicallibrary.org/aristotle/metaphysics/>. Book 1, Part 6.
- : positioning a and constructing the infinite out of great and small, instead of treating the infinite as one, is pucliar to him;
- (music) any set of two different pitch classes.
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Full Definition of dyad