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- Dictionarytertiary/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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