1Third in order or level: most of the enterprises were of tertiary importance the tertiary stage of the disease
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- Yet the poor still resort to the public services for more of their secondary and tertiary level care than do the better off.
- There is a strong echo of elegance, but the tertiary flavours of nut and oxidised or Madeira-like notes are now coming to the foreground.
- The Mediterranean theater has long been a theater of tertiary importance to the legion of historians writing about World War II.
1.1chiefly British Relating to or denoting education at a level beyond that provided by schools, especially that provided by a college or university.
- In response to the need to improve access to tertiary education, universities are increasingly implementing online delivery solutions.
- Physicians and some nurses are educated at universities, and tertiary education is expensive.
- The scholarship also involves tertiary study through the University of Queensland.
1.2Relating to or denoting the medical treatment provided at a specialist institution.
- A dermatologist from an academic tertiary care medical center agreed to serve as an expert consultant.
- He continued to have moderate angina and was referred to a tertiary care medical center for evaluation.
- During 1990-2000, 194 new patients were referred to a specialist tertiary centre for the treatment and management of venous leg ulcers.
2 (Tertiary) Geology Relating to or denoting the first period of the Cenozoic era, between the Cretaceous and Quaternary periods, and comprising the Paleogene and Neogene subperiods.
- The annihilation of the dinosaurs marks the boundary linking Cretaceous time and Tertiary time.
- In contrast to parts of the External Hellenides, the Menderes nappes do not show Tertiary high-pressure metamorphism.
- A cover of undeformed Middle-Upper Miocene to Pliocene rocks is present in all the Tertiary basins.
3 Chemistry (Of an organic compound) having its functional group located on a carbon atom that is itself bonded to three other carbon atoms.
- If the hydroxyl group is bound to a carbon atom that is itself bound to three other carbon atoms then the resultant alcohol is a tertiary alcohol.
- The reaction of Grignard reagents with carbonyl compounds is used to prepare primary, secondary, and tertiary alcohols.
- Esters can be used to manufacture tertiary alcohols by using a Grignard reagent.
3.1 Chemistry (Chiefly of amines) derived from ammonia by replacement of three hydrogen atoms by organic groups.
- This photoreaction is highly dependent on the amine structure and is efficient only in the presence of tertiary aliphatic amines.
- This enzyme system catalyses the oxidative deamination of primary aromatic amines, long-chain diamines and tertiary cyclic amines.
- One or more of the hydrogens of the ammonia is replaced with an organic acid group to produce a primary, secondary, or tertiary amide.
2A lay associate of certain Christian monastic organizations: a Franciscan tertiary
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- Though contemporary treatises recommended that widows and Franciscan tertiaries be discreetly covered, there is evidence that in their demeanor and in their dress younger widows were perceived as presenting a seductive appeal to men.
- If we take St Francis of Assisi as the likely subject, however, a direct relationship emerges with St Elizabeth of Hungary and her great-niece St Elizabeth of Portugal, both of whom were Franciscan tertiaries.
- The beguines and tertiaries, and to some extent the newer Cistercian nuns, were drawn from rising social strata - new groups that may have been anxious about their wealth and status.
Mid 16th century (sense 2 of the noun): from Latin tertiarius 'of the third part or rank', from tertius 'third'.
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