Tertiary (disambiguation)
# Tertiary (disambiguation)

The Tertiary is a geologic period.

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

* Tertiary (chemistry), a term describing bonding patterns in organic chemistry
* In biochemistry, the tertiary structure of a protein is its overall shape, also known as its fold
* Tertiary consumer, in ecology
* Tertiary feathers or tertials, feathers attached to humerus or inner portion of the wings of birds
* Tertiary color, a color made up by mixing one primary color with one secondary color, in a given color space
* Tertiary sector of the economy, or the service sector
* Tertiary education, educational levels following the completion of secondary education such as university or trade school
* Tertiary care, specialized consultative healthcare
* Tertiary, a member of a third order religious group
* Tertiary source, in research
* Tertiary stress, a proposed level of stress in phonetics
