Optical; used in viewing or prospecting: used especially in the phrase perspective glass—that is, a telescope, and specifically a terrestrial as distinguished from an astronomical telescope.Of or pertaining to the art of representing solid objects upon a flat surface.Represented in perspective; throughly and duly proportioned in its parts; not anamorphous or distorted; true: as, a perspective plan. See II.n. A reflecting glass or combination of glasses producing some kind of optical delusion or anamorphous effect when viewed in one way, but presenting objects in their true forms when viewd in another.n. A magnifying-glass; a telescope; a spy-glass.n. The art of representing solid objects on a flat surface so that when they are viewed the eye is affected in the same manner as it would be by viewing objects themselves from a given point.n. A drawing or representation in perspective; specifically, a painting so placed at the end of an alley, a garden, or the like, as to presenst the appearance of continuing it, and thus produce the impression of greater length or extent. Stage scenic painting is of this nature.n. Prospect; View; Vista.n. Proper or just proportion; appropriate realtion of parts to one another and to the whole view, subject, etc.In geometry, said of two figures when each point of one can be so paired with a point of the other that the joins of all the pairs concur in one point.