Definitions
1.nounA quaternary compound.
2.nounThe Quaternary period or the system of deposits laid down during it.
3.adjectiveOf fourth rank or order"the quaternary stress in a pronounced word"
4.adjectiveOf a mathematical expression containing e.g. x4
5.adjectiveRelating to or in number base four
6.adjectiveQuaternary ammonium
7.adjectiveComposed of four elements