Definition quaternary
Etymology
From the Latin quaternārius (“containing or consisting of four”), from quaternī (“four each”, “four at a time”) + -ārius (whence the English suffix -ary); compare the French quaternaire.
Adjective
quaternary (not comparable)
- Of fourth rank or order
- Of a mathematical expression containing e.g. x
- Relating to or in number base four
- (organic chemistry) quaternary ammonium
Noun
quaternary (plural quaternaries)
- (chemistry) A quaternary compound.
- (geology) The Quaternary period or the system of deposits laid down during it.
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