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From The Collaborative International Dictionary of English v.0.48:
Sagacious \Sa*ga"cious\, a. [L. sagax, sagacis, akin to sagire to perceive quickly or keenly, and probably to E. seek. See Seek, and cf. Presage.] 1. Of quick sense perceptions; keen-scented; skilled in following a trail. [1913 Webster] Sagacious of his quarry from so far. --Milton. [1913 Webster] 2. Hence, of quick intellectual perceptions; of keen penetration and judgment; discerning and judicious; knowing; far-sighted; shrewd; sage; wise; as, a sagacious man; a sagacious remark. [1913 Webster] Instinct . . . makes them, many times, sagacious above our apprehension. --Dr. H. More. [1913 Webster] Only sagacious heads light on these observations, and reduce them into general propositions. --Locke. [1913 Webster] Syn: See Shrewd. [1913 Webster] -- Sa*ga"cious*ly, adv. -- Sa*ga"cious*ness, n. [1913 Webster]