Source : Webster's Revised Unabridged Dictionary (1913)

Excogitate \Ex*cog"i*tate\v. t. [imp. & p. p. {Excogitated}; p.
   pr. & vb. n.. {Excogitating}.] [L. excogitatus, p. p. of
   excogitare to excogitate; ex out + cogitare to think. See
   {Cogitate}.]
   To think out; to find out or discover by thinking; to devise;
   to contrive. ``Excogitate strange arts.'' --Stirling.

         This evidence . . . thus excogitated out of the general
         theory.                                  --Whewell.