| Word | Definitions | Synonyms |
|---|---|---|
| quaternary | (adjective) consisting of or especially arranged in sets of four | Synonyms: quaternate |
| (adjective) coming next after the third and just before the fifth in position or time or degree or magnitude | Synonyms: 4th, fourth | |
| quaternate | (adjective) consisting of or especially arranged in sets of four | Synonyms: quaternary |