quaternary

definition: coming next after the third and just before the fifth in position or time or degree or magnitude
example: the quaternary period of geologic time extends from the end of the tertiary period to the present
speech part: adjective
synonyms: fourth
definition: consisting of or especially arranged in sets of four
example:
speech part: adjective
synonyms: quaternate
definition: the cardinal number that is the sum of three and one
example:
speech part: noun
synonyms: four
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