sagacity

From French sagacité, from Latin sagācitās (“sagaciousness”), from sagāx (“of quick perception, acute, sagacious”), from sāgiō (“I perceive by the senses”).

• IPA^(key): /səˈɡæsəti/, /səˈɡæsɪti/

sagacity (usually uncountable, plural sagacities)

1. (obsolete) Keen sense of smell.
   • 1607, Edward Topsell, The History of Four-footed Beasts, Serpents, and Insects, London: G. Sawbridge et al., 1658, p. 352,

     […] this Beast [the Ichneumon] is not only enemy to the Crocodile and Asp, but also to their Egs, which she hunteth out by the sagacity of her nose, and so destroyeth them […]

2. The quality of being sage, wise, or able to make good decisions; the quality of being perceptive, astute or insightful.
   • 1813, Jane Austen, Pride and Prejudice, Volume 3, Chapter 15,

     Young ladies have great penetration in such matters as these; but I think I may defy even your sagacity, to discover the name of your admirer.

   • 1904, M. P. Shiel, The Evil That Men Do, London: Ward, Lock & Co., Chapter ,

     Immediately after the meal, when he was alone again, he set to work to examine Drayton’s papers, of which there lay quite a mass on the table near him and, leaning toward the lamp on his elbow, he weighed the meaning of each with a certain sideward sagacity of gaze, a sagacity that smiled in its self-sureness.

     Swiss Family Robinson- "....near the mouth of a creek, towards which all our geese and ducks betook themselves; and I, relying on their sagacity, followed in the same course."

• wisdom
• sagaciousness

• sagacious

• sagacity in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• sagacity in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• sagacity at OneLook Dictionary Search