Per·spi·ca·cious a.
1. Having the power of seeing clearly; quick-sighted; sharp of sight.
2. Fig.: Of acute discernment; keen.
-- Per*spi*ca*cious*ly, adv. -- Per*spi*ca*cious*ness, n.
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perspicaciousness
n : intelligence manifested by being astute (as in business
dealings) [syn: shrewdness, astuteness, perspicacity]