Definitions from Wiktionary (Quaternary)

▸ adjective:  Of fourth rank or order.
▸ adjective:  Of a mathematical expression containing e.g. x⁴.
▸ adjective:  Relating to or in number base four.
▸ adjective:  (organic chemistry) quaternary ammonium.
▸ adjective:  (inorganic chemistry) Composed of four elements.
▸ noun:  (chemistry) A quaternary compound.
▸ noun:  (geology) The Quaternary period or the system of deposits laid down during it.
▸ noun:  (geology) The geological period of the Cenozoic Era immediately following the Tertiary. It is subdivided into the Pleistocene and the Holocene Epochs.
▸ noun:  Alternative letter-case form of quaternary. [(chemistry) A quaternary compound.]





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