Geom.
a projection of one plane onto a second plane such that a point on the first plane and its image on the second plane lie on a straight line through a fixed point not on either plane.
Geom.
a projection of one plane onto a second plane such that a point on the first plane and its image on the second plane lie on a straight line through a fixed point not on either plane.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012