Unnumbered source etymology
Original entry ↗A set of two elements treated as one; a pair. · Two persons in an ongoing relationship; a dyadic relationship. · The relationship or interaction itself in reference to a couple. · Any set of two different pitch classes.
From Ancient Greek δυάς (duás), δυάδ- (duád-) from δύο (dúo, “two”), from Proto-Indo-European *duwó, *duwéh₃ (*dwóh₁). The mathematics sense was coined by American scientist Josiah Willard Gibbs in 1884 in the second half of his book Elements of Vector Analysis.
Relationships mentioned by the source
These are extracted mentions, not a timeline or a verified sequence of immediate parents.
This page abbreviates 4 auxiliary source items. The etymology narrative is not shortened. Omission counts are available in the audit fields below; consult the original for complete auxiliary material.
Inspect preserved source fields
Raw extraction fields are retained for auditing. Their order does not establish ancestry.
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