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The Collaborative International Dictionary of English v.0.48:

Tertiary \Ter"ti*a*ry\, n.; pl. Tertiaries. 1. (R. C. Ch.) 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. --Addis & Arnold. [1913 Webster] 2. (Geol.) The Tertiary era, period, or formation. [1913 Webster] 3. (Zool.) One of the quill feathers which are borne upon the basal joint of the wing of a bird. See Illust. of Bird. [1913 Webster]