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Adjective: tertiary  'tur-shee,e-ree [N. Amer], tur-shu-ree [Brit]
  1. Coming next after the second and just before the fourth in position
    - third, 3rd
Noun: Tertiary
  1. From 63 million to 2 million years ago
    - Tertiary period

Derived forms: Tertiaries

See also: ordinal

Type of: geological period, period

Part of: Age of Mammals, Cenozoic, Cenozoic era

Encyclopedia: Tertiary, or services sector