fourth in order or rank; belonging to the fourth order
relating to or denoting the most recent period in the Cenozoic era, following the Tertiary period and comprising the Pleistocene and Holocene epochs
denoting an ammonium compound containing a cation of the form NR₄ ⁺, where R represents organic groups or atoms other than hydrogen
the Quaternary period or the system of deposits laid down during it
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