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Quaternary Definition

(adjective)
definitions

fourth in order or rank; belonging to the fourth order


(adjective)
definitions

relating to or denoting the most recent period in the Cenozoic era, following the Tertiary period and comprising the Pleistocene and Holocene epochs


(adjective)
definitions

denoting an ammonium compound containing a cation of the form NR₄ ⁺, where R represents organic groups or atoms other than hydrogen


(noun)
definitions

the Quaternary period or the system of deposits laid down during it


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