(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.

Of third rank or order; subsequent. / (chemistry) Possessing some quality in the third degree; especially having been subjected to the substitution of three atoms or radicals.

Any item considered to be of third order. / A tertiary colour. / (geology) Something from the Tertiary Period (the former term for the geologic period from 65 million to 2.58 million years ago).

plural of tertiary

(British spelling) Any colour that results from the mixing of two secondary colours, or of a primary colour and an adjacent secondary colour.

(general scholarship and historiography) A selection, distillation, summary or compilation of primary sources, secondary sources, or both.

Alternative spelling of tertiary colour

higher education

plural of tertiary source