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Entry 4 senses · 2 variants Webster, 1913

Quaternary

/kwŏt′ər-nĕr′ē/ · Qua·ter·na·ry · IPA /ˈkwɑ.tɚˌnɛɹ.i/
01 a. Consisting of four; by fours, or in sets of four.
  1. 1.
    Consisting of four; by fours, or in sets of four.
  2. 2.
    Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man.(Geol.)
02 n. The number four.
  1. 1.
    The number four.
  2. 2.
    The Quaternary age, era, or formation. See the Chart of Geology.(Geol.) See: Geology