(1):
(n.) The Tertiary era, period, or formation.
(2):
(n.) One of the quill feathers which are borne upon the basal joint of the wing of a bird. See Illust. of Bird.
(3):
(a.) Being of the third formation, order, or rank; third; as, a tertiary use of a word.
(4):
(a.) Later than, or subsequent to, the Secondary.
(5):
(a.) 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.
(6):
(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.
(7):
(a.) Growing on the innermost joint of a bird's wing; tertial; - said of quills.