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projection (n.)

late 15c., projeccioun, in alchemy, "transmutation by casting a powder on molten metal," from Old French projeccion and directly from Latin proiectionem (nominative proiectio) "a throwing forward, a stretching out," noun of action from past-participle stem of proicere "stretch out, throw forth" (see project (v.)).

From 1560s in the cartographical sense of "system of continuous correspondence between the points of a spherical surface and those of a plane." From 1590s as "action of projecting." From 1756 as "that which projects or juts out."

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Definitions of projection from WordNet

projection (n.)
a prediction made by extrapolating from past observations;
projection (n.)
the projection of an image from a film onto a screen;
projection (n.)
any structure that branches out from a central support;
projection (n.)
any solid convex shape that juts out from something;
projection (n.)
(psychiatry) a defense mechanism by which your own traits and emotions are attributed to someone else;
projection (n.)
the acoustic phenomenon that gives sound a penetrating quality;
a prime ingredient of public speaking is projection of the voice
our ukuleles have been designed to have superior sound and projection
Synonyms: acoustic projection / sound projection
projection (n.)
the representation of a figure or solid on a plane as it would look from a particular direction;
projection (n.)
the act of projecting out from something;
Synonyms: protrusion / jut / jutting
projection (n.)
the act of expelling or projecting or ejecting;
Synonyms: expulsion / ejection / forcing out
projection (n.)
a planned undertaking;
Synonyms: project
From wordnet.princeton.edu