Synonyms: IV, Little Joe, tetrad, 4, four, foursome, quartet, quatern, quaternary, quaternion, quaternity, quadruplet
Definition: the cardinal number that is the sum of three and one
Definition: one of the elements that collectively form a system of numeration
Usage: 0 and 1 are digits
Synonyms: Quaternary, Quaternary period, Age of Man
Definition: last 2 million years
Similar words: period, geological period
Definition: a unit of geological time during which a system of rocks formed
Usage: ganoid fishes swarmed during the earlier geological periods
Synonyms: 4th, fourth, quaternary
Definition: coming next after the third and just before the fifth in position or time or degree or magnitude
Usage: the quaternary period of geologic time extends from the end of the tertiary period to the present
Similar words: ordinal
Definition: being or denoting a numerical order in a series
Usage: ordinal numbers; held an ordinal rank of seventh
Synonyms: quaternary, quaternate
Definition: consisting of or especially arranged in sets of four
Usage: quaternate leaves; a quaternary compound
Similar words: multiple
Definition: having or involving or consisting of more than one part or entity or individual
Usage: multiple birth; multiple ownership; made multiple copies of the speech; his multiple achievements in public life; her multiple personalities; a pineapple is a multiple fruit