cenozoic Meaning, Definition & Usage

  1. noun approximately the last 63 million years
    Age of Mammals; Cenozoic era.
  2. adjective of or relating to or denoting the Cenozoic era

WordNet

Ce`no*zo"ic adjective
Etymology
Gr. recent + life.
Definitions
  1. (Geol.) Belonging to the most recent division of geological time, including the tertiary, or Age of mammals, and the Quaternary, or Age of man. Written also cænozoic, cainozoic, kainozoic. See Geology. ✍ This word is used by many authors as synonymous with Tertiary, the Quaternary Age not being included.

Webster 1913