QUATERNARY
- a set of four [n QUATERNARIES]
- Fourth in order or rank; belonging to the fourth order
- Of, relating to, or denoting the most recent period in the Cenozoic era, following the Tertiary period and comprising the Pleistocene and Holocene epochs (and thus including the present)
- Denoting an ammonium compound containing a cation of the form NR4+, where R represents organic groups or atoms other than hydrogen
- (of a carbon atom) Bonded to four other carbon atoms
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