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WordNet 3.0Copyright Princeton University
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n. - The cardinal number that is the sum of three and one adj. - Coming next after the third and just before the fifth in position or time or degree or magnitude; Consisting of or especially arranged in sets of four.

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Usage examples (38)
  • The quaternary period of geologic time extends from the end of the tertiary period to the present
  • Other injuries caused by an explosion, such as burns, are called quaternary injuries.
  • The quaternary is the most perfect number, and the root of other numbers, and of all things.
  • The current one is known as the quaternary glaciation and started about 4 million years ago.
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We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.