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From either the Middle French projection or its etymon, the Classical Latin prōiectiō (stem: prōiectiōn-), from prōiciō. Compare the Modern French projection, the German Projektion, and the Italian proiezione.


  • IPA(key): /pɹəˈd͡ʒɛkʃən/
  • (file)
  • Rhymes: -ɛkʃən


projection (countable and uncountable, plural projections)

  1. Something which projects, protrudes, juts out, sticks out, or stands out.
    The face of the cliff had many projections that were big enough for birds to nest on.
  2. The action of projecting or throwing or propelling something.
    1. (archaic) The throwing of materials into a crucible, hence the transmutation of metals.
  3. (archaic) The crisis or decisive point of any process, especially a culinary process.
  4. The display of an image by devices such as movie projector, video projector, overhead projector or slide projector.
  5. A forecast or prognosis obtained by extrapolation
  6. (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.
    • 1937, John W. Vann, “To What Extent Is Reality Adjustment Concerned In The Selection Of The Flying Trainee?”, in United States Naval Medical Bulletin, volume 35, page 437:
      Projection ia another mechanism of defense and is one that is utilized almost universally to explain one's minor mistakes, and in many cases the minor failures as well. By projection we place the blame for our acts upon others....
    • 1980 May 1, Judith Plaskow, “Blaming Jews for Inventing Patriarchy”, in Lilith Magazine, volume 7:
      The morality of patriarchy, Mary Daly argues, is charactrized by "a failure to lay claim to that part of the psyche that is then projected onto 'the Other.'"
  7. (photography) The image that a translucent object casts onto another object.
  8. (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.
  9. (geometry) An image of an object on a surface of fewer dimensions.
  10. (linear algebra) An idempotent linear transformation which maps vectors from a vector space onto a subspace.
  11. (mathematics) A transformation which extracts a fragment of a mathematical object.
  12. (category theory) A morphism from a categorical product to one of its (two) components.
  13. (grammar) The preservation of the properties of lexical items while generating the phrase structure of a sentence. See Projection principle.


Derived terms[edit]

Compound words
Expressions: eponymous
Expressions: other

Related terms[edit]


Further reading[edit]




projection f (plural projections)

  1. (linear algebra, cartography, mathematics, psychology) projection
  2. (film) a screening or viewing (of a film)

Further reading[edit]



projection (plural projectiones)

  1. projection