Number & MeasureGreek → English
Dyad
/ˈdaɪæd/noun
A pair treated as a single unit.
The Greek roots
δυάς
dyás
the number two, a pair
Literally: “a group of two”
Follow a root:δυάς1 word
The story of the word
Pythagorean arithmetic made δυάς a principle rather than a count: the monad was unity, the dyad the first division, the start of difference and therefore of everything measurable. Renaissance mathematicians borrowed the word with that metaphysics still clinging to it. Modern use is flat by comparison, and sociology takes the dyad as the smallest group that can have a relationship at all, the one that dies if either member leaves.
- How it travelled
- Ancient Greek → Late Latin → English
- First recorded
- 17th century
Same family
dyadicmonadtriadtetrad
In a sentence
Therapists talk about the mother-infant dyad as though it were one organism.
Add a third person and the dyad turns into something with politics.