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dyad (n.)

"the number two, two units treated as one," 1670s, from Latin dyad-, stem of dyas, from Greek dyas "the number two, a group of two," from duo "two" (from PIE root *dwo- "two"). Specific sense in chemistry ("a bivalent element") is by 1865; also used in biology, poetics, mathematics. Related: Dyadic.

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Definitions of dyad from WordNet

dyad (n.)
two items of the same kind;
Synonyms: couple / pair / twosome / twain / brace / span / yoke / couplet / distich / duo / duet / duad
From wordnet.princeton.edu