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|(Persp.)||the point in which a right line, drawn from the eye, parallel to a given right line, cuts the perspective plane; so called to distinguish it from the principal point, or point of view, where a line drawn from the eye perpendicular to the perspective plane meets this plane.|
See also: Accidental
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.