noun

• Something which projects, protrudes, juts out, sticks out, or stands out.
• The action of projecting or throwing or propelling something.
• (archaic) The crisis or decisive point of any process, especially a culinary process.
• The display of an image by devices such as movie projector, video projector, overhead projector or slide projector.
• A forecast or prognosis obtained by extrapolation
• (psychology) A belief or assumption that others have similar thoughts and experiences to one's own. This includes making accusations that would more fittingly apply to the accuser.
• (photography) The image that a translucent object casts onto another object.
• (cartography) Any of several systems of intersecting lines that allow the curved surface of the earth to be represented on a flat surface. The set of mathematics used to calculate coordinate positions.
• (geometry) An image of an object on a surface of fewer dimensions.
• (linear algebra) An idempotent linear transformation which maps vectors from a vector space onto a subspace.
• (mathematics) A transformation which extracts a fragment of a mathematical object.
• (category theory) A morphism from a categorical product to one of its (two) components.
• (grammar) The preservation of the properties of lexical items while generating the phrase structure of a sentence. See Projection principle.
• (alchemy, obsolete) A supposed mechanism for the transmutation of large quantities of base metals.