Perspi*ca"cious*ness

from The Collaborative International Dictionary of English v.0.48

Perspicacious \Per`spi*ca"cious\ (p[~e]r`sp[i^]*k[=a]"sh[u^]s),
   a. [L. perspicax, -acis, fr. perspicere to look through: cf.
   F. perspicace. See {Perspective}.]
   1. Having the power of seeing clearly; quick-sighted; sharp
      of sight.
      [1913 Webster]

   2. Fig.: Of acute discernment; keen.
      [1913 Webster] -- {Per`spi*ca"cious*ly}, adv. --
      {Per`spi*ca"cious*ness}, n.
      [1913 Webster]