quaternary

1. Last 2 million years (synset 115149497)
   is an instance of: geological period, period - a unit of geological time during which a system of rocks formed
   has:

   • holocene, holocene epoch, recent, recent epoch - approximately the last 10,000 years
   • glacial epoch, pleistocene, pleistocene epoch - from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
   is a part of: age of mammals, cenozoic, cenozoic era - approximately the last 63 million years
   same as: age of man, quaternary period
2. The cardinal number that is the sum of three and one (synset 113766444)
   is a type of: digit, figure - one of the elements that collectively form a system of numeration
   same as: 4, four, foursome, iv, little joe, quadruplet, quartet, quatern, quaternion, quaternity, tetrad

1. Consisting of or especially arranged in sets of four (synset 302227350)
   "quaternate leaves"; "a quaternary compound"
   similar to: multiple - having or involving or consisting of more than one part or entity or individual
   same as: quaternate
2. Coming next after the third and just before the fifth in position or time or degree or magnitude (synset 302210112)
   "the quaternary period of geologic time extends from the end of the tertiary period to the present"
   similar to: ordinal - being or denoting a numerical order in a series
   same as: 4th, fourth

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