資料來源 : Webster's Revised Unabridged Dictionary (1913)

Perspective \Per*spec"tive\, n. [F. perspective, fr. perspectif:
   cf. It. perspettiva. See {Perspective}, a.]
   1. A glass through which objects are viewed. [Obs.] ``Not a
      perspective, but a mirror.'' --Sir T. Browne.

   2. That which is seen through an opening; a view; a vista.
      ``The perspective of life.'' --Goldsmith.

   3. The effect of distance upon the appearance of objects, by
      means of which the eye recognized them as being at a more
      or less measurable distance. Hence, a["e]rial perspective,
      the assumed greater vagueness or uncertainty of outline in
      distant objects.

            A["e]rial perspective is the expression of space by
            any means whatsoever, sharpness of edge, vividness
            of color, etc.                        --Ruskin.

   4. The art and the science of so delineating objects that
      they shall seem to grow smaller as they recede from the
      eye; -- called also {linear perspective}.

   5. A drawing in linear perspective.

   {Isometrical perspective}, an inaccurate term for a
      mechanical way of representing objects in the direction of
      the diagonal of a cube.

   {Perspective glass}, a telescope which shows objects in the
      right position.