- Being of the third formation, order, or rank; third; as,
a tertiary use of a word. - Possessing some quality in the third degree; having been
subjected to the substitution of three atoms or radicals; as, a
tertiary alcohol, amine, or salt. Cf. Primary, and Secondary. - Later than, or subsequent to, the Secondary. - Growing on the innermost joint of a bird's wing; tertial;
-- said of quills.
2 . Tertiary
[ n.]
- A member of the Third Order in any monastic system; as,
the Franciscan tertiaries; the Dominican tertiaries; the Carmelite
tertiaries. See Third Order, under Third. - The Tertiary era, period, or formation. - One of the quill feathers which are borne upon the basal
joint of the wing of a bird. See Illust. of Bird.
Tertiary sector Tertiary sector is that part of an economy that provides services (nursing care, psychological counseling, and so forth) engaged in by both private and government entities.