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Tertiary (from Latin tertiarius) is an adjective meaning "third" or "third hand". It may refer to:
- The Tertiary period of the geologic time scale.
- In economics the tertiary sector (of industry) is the service sector or the service industry (as opposed to the primary -agricultural and natural resources- and secondary, manufacturing)
- Tertiaries, members of a Third order (lay folk connected with a Mendicant Order).
- A tertiary consumer in an ecological sense.
- A Tertiary functional group (or usually ion) attached to carbon atom connected to three other carbon atoms in organic chemistry
- A tertiary alcohol (tert), which has three carbon atoms connected to the carbon atom that bears the hydroxyl group.
- Tertiaries, the smallest group of remiges (wing feathers), which attach to the wings of birds. Usually, they are not flight feathers, but resemble body plumage.
- In biochemistry, the tertiary structure of a protein is its overall shape, also known as its fold
- Tertiary or higher education
- Tertiary care, specialized consultative healthcare.
- Ternary operation, in computer science a ternary operator (sometimes incorrectly referred to as a tertiary operator), an operator that takes three arguments
- Tertiary color, a color made up by mixing one primary color with one secondary color, in a given color space
- Tertiary stress, a proposed degree of stress in linguistics
- A member of a third order religious group
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