 quaternary |
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| 1. | [ noun ] (geology) last 2 million years | |
| Synonyms: | Age_of_Man Quaternary_period | |
| Related terms: | period Cenozoic Pleistocene Holocene | |
| 2. | [ adjective ] (geology) coming next after the third and just before the fifth in position or time or degree or magnitude | |
| Synonyms: | fourth 4th | |
| Examples: | "the quaternary period of geologic time extends from the end of the tertiary period to the present" |
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| Related terms: | ordinal | |
| 3. | [ adjective ] consisting of or especially arranged in sets of four | |
| Synonyms: | quaternate | |
| Examples: | "quaternate leaves" "a quaternary compound" |
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| Related terms: | multiple | |
| 4. | [ noun ] (mathematics) the cardinal number that is the sum of three and one | |
| Synonyms: | four 4 quartet quatern tetrad quaternity quaternion quadruplet foursome Little_Joe IV | |
| Related terms: | digit | |
| Similar spelling: |
quatern quaternity quaternion quaternate quatrain |
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