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The Collaborative International Dictionary of English v.0.48 (gcide)

Sagacity \Sa*gac"i*ty\, n. [L. sagacitas. See {Sagacious}.]
The quality of being sagacious; quickness or acuteness of
sense perceptions; keenness of discernment or penetration
with soundness of judgment; shrewdness.
[1913 Webster]

Some [brutes] show that nice sagacity of smell.
--Cowper.
[1913 Webster]

Natural sagacity improved by generous education. --V.
Knox.
[1913 Webster]

Syn: Penetration; shrewdness; judiciousness.

Usage: {Sagacity}, {Penetration}. Penetration enables us to
enter into the depths of an abstruse subject, to
detect motives, plans, etc. Sagacity adds to
penetration a keen, practical judgment, which enables
one to guard against the designs of others, and to
turn everything to the best possible advantage.
[1913 Webster]