Tertiary (from Latin, meaning 'third' or 'of the third degree/order..') may refer to: *

Tertiary period The Tertiary ( ) is an obsolete Period (geology), geologic period spanning 66 million to 2.6 or 1.8 million years ago. The period began with the extinction of the non-bird, avian dinosaurs in the Cretaceous–Paleogene extinction event, at t ...

, an obsolete geologic period spanning from 66 to 2.6 million years ago * Tertiary (chemistry), a term describing bonding patterns in organic chemistry * Tertiary care, specialized consultative healthcare * Tertiary color, a color made up by mixing one primary color with one secondary color, in a given color space * Tertiary consumer, in ecology *

Tertiary education Tertiary education (higher education, or post-secondary education) is the educational level following the completion of secondary education. The World Bank defines tertiary education as including universities, colleges, and vocational schools ...

, educational levels following the completion of secondary education such as university or trade school * Tertiary feathers or tertials, feathers attached to humerus or inner portion of the wings of birds *

Tertiary sector of the economy The tertiary sector of the economy, generally known as the service sector, is the third of the three economic sectors in the three-sector model (also known as the economic cycle). The others are the primary sector (raw materials) and the seco ...

, or the service sector * Tertiary source, in research * Tertiary stress, a proposed level of stress in phonetics * In biochemistry, the tertiary structure of a protein is its overall shape, also known as its fold * Tertiary, a member of a third order religious group

See also