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From The Collaborative International Dictionary of English v.0.48:
Cenozoic \Ce`no*zo"ic\, a. [Gr. ? recent + ? life.] (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 c[ae]nozoic, cainozoic, kainozoic.] See Geology. [1913 Webster] Note: This word is used by many authors as synonymous with Tertiary, the Quaternary Age not being included. [1913 Webster]