·noun The Tertiary era, period, or formation.
II. Tertiary ·adj Later than, or subsequent to, the Secondary.
III. Tertiary ·adj Growing on the innermost joint of a bird's wing; tertial;
— said of quills.
IV. Tertiary ·adj Being of the third formation, order, or rank; third; as, a tertiary use of a word.
V. Tertiary ·noun One of the quill feathers which are borne upon the basal joint of the wing of a bird. ·see ·Illust. of Bird.
VI. Tertiary ·adj 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.
VII. Tertiary ·noun 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.