quaternary

Definitions of quaternary
1

adj consisting of or especially arranged in sets of four

“a quaternary compound”
Synonyms:
quaternate
multiple
having or involving or consisting of more than one part or entity or individual

adj coming next after the third and just before the fifth in position or time or degree or magnitude

“the quaternary period of geologic time extends from the end of the tertiary period to the present”
Synonyms:
4th, fourth
ordinal
being or denoting a numerical order in a series

n the cardinal number that is the sum of three and one

Synonyms:
4, IV, Little Joe, four, foursome, quadruplet, quartet, quatern, quaternion, quaternity, tetrad
Type of:
digit, figure
one of the elements that collectively form a system of numeration

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