1. consisting of four.
2. arranged in fours.
3. (initial capital letter) Geology. noting or pertaining to the present period of earth history, forming the latter part of the Cenozoic Era, originating about 2 million years ago and including the Recent and Pleistocene Epochs.
4. Metallurgy. (of an alloy) having four principal constituents. noun, plural quaternaries.
5. a group of four.
6. the number four.
7. (initial capital letter) Geology. the Quaternary Period or System.
"sectors can be quaternary."
"changes can be quaternary."
"geologies can be quaternary."
"researchs can be quaternary."
"geographies can be quaternary."
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