The definition of tertiary is third.
An example of tertiary is the third level of seats in a theater.
- of the third rank, order, formation, stage, etc.; third
- third in order or type; involving the substitution of three atoms or radicals
- characterized by or designating a carbon atom or group attached to three other carbon atoms or groups in a chain or ring
- Geol. designating or of the former first geologic period of the Cenozoic Era, characterized by the formation of major mountain ranges, the first grasses and grasslands, and the development of mammals as the dominant animal: now divided into the Paleogene and Neogene periods
- designating, of, or being the third strongest of the four phonemic degrees of stress
- a mark used to indicate this
- R.C.Ch. of a Third Order
- Zool. tertial
Origin of tertiaryClassical Latin tertiarius ; from tertius, third
- R.C.Ch. a member of a Third Order
- Zool. tertial
the Tertiary Period or its rocks
- Third in place, order, degree, or rank.
- Of, relating to, or designating the short flight feathers nearest the body on the rear edge of a bird's wing.
- Chemistry a. Of, relating to, or having a carbon atom that is attached to three other carbon atoms in a molecule.b. Of or relating to the replacement of three of several atoms or groups in a compound, such as an amine in which three valences of the functional group are taken by carbon atoms.c. Of or relating to salts of acids containing three replaceable hydrogen atoms.
- Tertiary Of, relating to, or being the period of geologic time from about 65 to about 1.8 million years ago, the older of the two periods of the Cenozoic Era. The Tertiary Period is characterized by the appearance of modern flora, insects, fish, amphibians, and reptiles, and by the dominance of mammals as vertebrate life forms on land. See Table at geologic time.
- A tertiary feather.
- Tertiary The Tertiary Period.
- Roman Catholic Church A member of a religious Third Order.
Origin of tertiaryLatin tertiarius, from tertius, third; see trei- in Indo-European roots.
- (geology) Of or pertaining to the first part of the Cenozoic era when modern flora and mammals appeared
- (geology) The first part of the Cenozoic era when modern flora and mammals appeared