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The Collaborative International Dictionary of English v.0.48 (gcide)

Perspective \Per*spec"tive\ (p[~e]r*sp[e^]k"t[i^]v), a. [L.
perspicere, perspectum, to look through; per spicere,
specere, to look: cf. F. perspectif; or from E. perspective,
n. See {Spy}, n.]
1. Of or pertaining to the science of vision; optical. [Obs.]
--Bacon.
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2. Pertaining to the art, or in accordance with the laws, of
perspective.
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{Perspective plane}, the plane or surface on which the
objects are delineated, or the picture drawn; the plane of
projection; -- distinguished from the {ground plane},
which is that on which the objects are represented as
standing. When this plane is oblique to the principal face
of the object, the perspective is called {oblique
perspective}; when parallel to that face, {parallel
perspective}.

{Perspective shell} (Zool.), any shell of the genus
{Solarium} and allied genera. See {Solarium}.
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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.
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2. That which is seen through an opening; a view; a vista.
"The perspective of life." --Goldsmith.
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3. The effect of distance upon the appearance of objects, by
means of which the eye recognizes 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.
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A["e]rial perspective is the expression of space by
any means whatsoever, sharpness of edge, vividness
of color, etc. --Ruskin.
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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}.
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5. A drawing in linear perspective.
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{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.
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