Preceded by two others in a series; 3d or 3rd
from 63 million to 2 million years ago
of a Third Order
The definition of primary is something that is the most important, among the most important, something that comes early in development or that is original and not derived from something else.
Possessing some quality, or having been subject to some operation (as substitution), in the second degree; as, a secondary salt, a secondary amine, etc. Compare primary.
Find another word for tertiary. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for tertiary, like: third order, primary, third, 3rd, secondary, Tertiary period, and null.