Definiciones
1.AdjectiveOf fourth rank or order."the quaternary stress in a pronounced word"
2.AdjectiveOf a mathematical expression containing e.g. x.
3.AdjectiveRelating to or in number base four.
4.Adjective(Can we verify this sense?) quaternary ammonium.
5.AdjectiveComposed of four elements.
6.NounA quaternary compound.
7.NounThe Quaternary period or the system of deposits laid down during it.