qua·ter·na·ry /ˈkwɑtə(r)ˌnɛri, kwəˈtɚ/
 (a.)由四要素形成的
 qua·ter·na·ry /ˈkwɑtə(r)ˌnɛrɪ, kwəˈtɝnərɪ/ 形容詞
 第四的,四元的,四價的,季的
 quaternary
 四進制的
 quaternary
 四進 四元
 Qua·ter·na·ry a.
 1. Consisting of four; by fours, or in sets of four.
 2. Geol. Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man.
 Qua·ter·na·ry, n.
 1. The number four.
 2. Geol. The Quaternary age, era, or formation. See the Chart of Geology.
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 quaternary
      adj 1: consisting of or especially arranged in sets of four;
             "quaternate leaves"; "a quaternary compound" [syn: quaternate]
      2: 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" [syn: fourth, 4th]
      n 1: last 2 million years [syn: Quaternary period, Age of Man]
      2: the cardinal number that is the sum of three and one [syn: four,
          4, IV, tetrad, quatern, quaternion, quaternity,
          quartet, quadruplet, foursome, Little Joe]