Source : Webster's Revised Unabridged Dictionary (1913)

Cosmothetic \Cos`mo*thet"ic\ (k?z`m?-th?t"?k), a. [Gr. ko`smos
   universe + ??? to place or arrange.] (Metaph.)
   Assuming or positing the actual existence or reality of the
   physical or external world.

   {Cosmothetic idealists} (Metaph.), those who assume, without
      attempting to prove, the reality of external objects as
      corresponding to, and being the ground of, the ideas of
      which only the mind has direct cognizance.

            The cosmothetic idealists . . . deny that mind is
            immediately conscious of matter.      --Sir W.
                                                  Hamilton.