# projection
## English
### Etymology

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

### Pronunciation

* IPA: /pɹəˈd͡ʒɛkʃən/
* Audio (Southern England):(file)
* Rhymes: -ɛkʃən

### Noun

projection (countable and uncountable, plural projections)
* 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.
* 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, including 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 is 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, 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.'"
* (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.
** 1666, Robert Boyle, The Origine of Formes and Qualities […], page 365:I speak not here of Projection, whereby one part of an Aurifick Powder is said to turn I know not how many 100 or 1000 parts of an ignobler metal into silver or gold […]
** 1689, Johann Rudolf Glauber, translated by Christopher Packe, The Works of the Highly Experienced and Famous Chymist, John Rudolph Glauber […], page 216:But yet I would that every one should understand me aright, and not count me so simple, as if I did liken or compare my Aurum Potabile with that great Stone of the Philosophers, which transmutes vast quantities of imperfect metals into most pure Gold by projection […]
** 1888, Arthur Edward Waite, Lives of Alchemystical Philosophers […], page 167: says, on another occasion, that an adept, after a few days of acquaintance, presented him with half a grain of the powder of projection, with which he transmuted nine ounces of quicksilver into pure gold.

#### Synonyms

* (something which sticks out): protuberance

#### Derived terms

* Aitoff projection
* Babinet projection
* first angle projection
* front projection
* Hammer projection
* Mollweide projection
* point-projection perspective
* power projection
* projectional → projectionally
* projectionism
* projectionist
* projectionless
* Robinson projection
* spiny projection neuron
* third angle projection
* time projection chamber
* van der Grinten projection
* astroprojection
* autoprojection
* deprojection
* eigenprojection
* holoprojection
* microprojection
* misprojection
* overprojection
* reprojection
* retroprojection
* Bonne projection
* Bottomley projection
* Fischer projection
* Gall-Peters projection
* Haworth projection
* Lissajous projection
* Littrow projection
* Werner projection
* 3D projection
* Albers projection
* astral projection
* axonometric projection
* back projection
* calligraphic projection
* cordiform projection
* dimetric projection
* Eckert projection
* first-angle projection
* gnomonic projection
* graphical projection
* isometric projection
* map projection
* oblique projection
* orthographic projection
* parallel projection
* perspective projection
* projection matrix
* rear projection
* stereographic projection
* third-angle projection
* trimetric projection

#### Related terms

* project
* projectable
* projective
* projectment
* projectome
* projector
* projecture

#### Translations
### Further reading

* projection on Wikipedia.Wikipedia

## French
### Etymology

Learned borrowing from Latin prōiectiō.

### Pronunciation

* IPA: /pʁɔ.ʒɛk.sjɔ̃/
* Audio:(file)

### Noun

projection f (plural projections)
* (psychology) projection
* (cartography) projection
* (linear algebra, mathematics) projection
* (film) screening or viewing of a film

#### Related terms

* projeter

### Further reading

* “projection”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

## Interlingua
### Noun

projection (plural projectiones)
* projection