QUATERNARY

quaternary|quaternion|quaternity. Quaternary, or Quaternion, or Quaternity, n. number four

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Qua‐ter″na‐ry (?), a. [[L. quaternarius consisting of four each, containing four, fr. quaterni four each, fr. quattuor four: cf. F. quaternaire. See Four.]] 1. 1. Consisting of four; by fours, or in sets of four.
2. 2. (Geol.) Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man.