Noun tertiary period has 1 sense
  1. Tertiary, Tertiary period - from 63 million to 2 million years ago
    --1 is a kind of period, geological period
    --1 is a part of Cenozoic, Cenozoic era, Age of Mammals
    --1 has parts:
     Pliocene, Pliocene epoch; Miocene, Miocene epoch; Oligocene, Oligocene epoch; Eocene, Eocene epoch; Paleocene, Paleocene epoch
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