quaternary

English Thesaurus

1. the cardinal number that is the sum of three and one (noun.quantity)

hypernym	:	digit, figure,
definition	:	one of the elements that collectively form a system of numeration (noun.quantity)

2. last 2 million years (noun.time)

instance hypernym	:	geological period, period,
definition	:	a unit of geological time during which a system of rocks formed (noun.time)

part holonym	:	holocene, holocene epoch, recent, recent epoch,
definition	:	approximately the last 10,000 years (noun.time)

part holonym	:	glacial epoch, pleistocene, pleistocene epoch,
definition	:	from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution (noun.time)

part meronym	:	age of mammals, cenozoic, cenozoic era,
definition	:	approximately the last 63 million years (noun.time)

3. coming next after the third and just before the fifth in position or time or degree or magnitude (adj.all)

similar	:	ordinal,
definition	:	being or denoting a numerical order in a series (adj.all)

4. consisting of or especially arranged in sets of four (adj.all)

similar	:	multiple,
definition	:	having or involving or consisting of more than one part or entity or individual (adj.all)