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1an estimate or forecast of a future situation or trend based on a study of present ones:plans based on projections of slow but positive growth population projection is essential for planning
2the presentation of an image on a surface, especially a movie screen:quality illustrations for overhead projection an image projected on a surface:the background projections featured humpback whales the ability to make a sound, especially the voice, heard at a distance:I taught him voice projection 3the presentation or promotion of someone or something in a particular way:the legal profession’s projection of an image of altruism a mental image viewed as reality:monsters can be understood as mental projections of mankind’s fears the unconscious transfer of one’s own desires or emotions to another person:we protect the self by a number of defense mechanisms, including repression and projection 4a thing that extends outward from something else:the particle board covered all the sharp projections 5 Geometry the action of projecting a figure.
6the representation on a plane surface of any part of the surface of the earth or a celestial sphere. (also map projection) a method for representing part of the surface of the earth or a celestial sphere on a plane surface.