Projection  n. 1 projecting or being projected. 2 thing that projects or obtrudes. 3 presentation of an image etc. On a surface. 4 forecast or estimate (projection of next year's profits). 5 a mental image viewed as an objective reality. B unconscious transfer of feelings etc. To external objects or persons. 6 representation on a plane surface of any part of the surface of the earth or a celestial sphere (mercator projection).  projectionist n. (in sense 3).