| Word | Definitions | Synonyms |
|---|---|---|
| dyad | (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duet, duo, pair, span, twain, twosome, yoke |
| dyadic | (adjective) of or relating to a dyad or based on two | - |
| dyarchy | (noun) a form of government having two joint rulers | Synonyms: diarchy |