What does the word tertiary mean?

Usage examples for tertiary

  1. Classification of Tertiary Strata. – The Student's Elements of Geology by Sir Charles Lyell
  2. This whole culture is secondary and tertiary, and it truly represents the respectable mediocrity from which it emanates. – Emerson and Other Essays by John Jay Chapman
  3. The first point of interest is the origin of these Tertiary mammals. – The Story of Evolution by Joseph McCabe