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    tertiary
    /ˈtəːʃ(ə)ri/

    adjective

    • 1. third in order or level: "the tertiary stage of the disease"
    • 2. relating to or denoting the first period of the Cenozoic era, between the Cretaceous and Quaternary periods, and comprising the Palaeogene and Neogene sub-periods.

    noun

    • 1. the Tertiary period or the system of rocks deposited during it.
    • 2. a lay associate of certain Christian monastic organizations: "a Franciscan tertiary"

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