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Definition of tertiary
1third in order or level:most of the enterprises were of tertiary importance the tertiary stage of the disease
chiefly British relating to or denoting education at a level beyond that provided by schools, especially that provided by a college or university.
relating to or denoting the medical treatment provided at a specialist institution. 2 (Tertiary) Geology of, relating to, or denoting the first period of the Cenozoic era, between the Cretaceous and Quaternary periods, and comprising the Paleogene and Neogene subperiods. 3 Chemistry (of an organic compound) having its functional group located on a carbon atom that is itself bonded to three other carbon atoms. Chemistry (chiefly of amines) derived from ammonia by replacement of three hydrogen atoms by organic groups.
) Geology the Tertiary period or the system of rocks deposited during it.
2a lay associate of certain Christian monastic organizations:a Franciscan tertiary