# Projection

Projection
Projection Pro*jec"tion, n. [L. projectio: cf. F. projection.] [1913 Webster] 1. The act of throwing or shooting forward. [1913 Webster]

2. A jutting out; also, a part jutting out, as of a building; an extension beyond something else. [1913 Webster]

3. The act of scheming or planning; also, that which is planned; contrivance; design; plan. --Davenant. [1913 Webster]

4. (Persp.) The representation of something; delineation; plan; especially, the representation of any object on a perspective plane, or such a delineation as would result were the chief points of the object thrown forward upon the plane, each in the direction of a line drawn through it from a given point of sight, or central point; as, the projection of a sphere. The several kinds of projection differ according to the assumed point of sight and plane of projection in each. [1913 Webster]

5. (Geog.) Any method of representing the surface of the earth upon a plane. [1913 Webster]

{Conical projection}, a mode of representing the sphere, the spherical surface being projected upon the surface of a cone tangent to the sphere, the point of sight being at the center of the sphere.

{Cylindric projection}, a mode of representing the sphere, the spherical surface being projected upon the surface of a cylinder touching the sphere, the point of sight being at the center of the sphere.

{Globular}, {Gnomonic}, {Orthographic}, {projection},etc. See under {Globular}, {Gnomonic}, etc.

{Mercator's projection}, a mode of representing the sphere in which the meridians are drawn parallel to each other, and the parallels of latitude are straight lines whose distance from each other increases with their distance from the equator, so that at all places the degrees of latitude and longitude have to each other the same ratio as on the sphere itself.

{Oblique projection}, a projection made by parallel lines drawn from every point of a figure and meeting the plane of projection obliquely.

{Polar projection}, a projection of the sphere in which the point of sight is at the center, and the plane of projection passes through one of the polar circles.

{Powder of projection} (Alchemy.), a certain powder cast into a crucible or other vessel containing prepared metal or other matter which is to be thereby transmuted into gold.

{Projection of a point on a plane} (Descriptive Geom.), the foot of a perpendicular to the plane drawn through the point.

{Projection of a straight line of a plane}, the straight line of the plane connecting the feet of the perpendiculars let fall from the extremities of the given line. [1913 Webster]

Syn: See {Protuberance}. [1913 Webster] [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Synonyms:

### Look at other dictionaries:

• projection — [ prɔʒɛksjɔ̃ ] n. f. • 1314; lat. projectio, de projectus, p. p. de projicere 1 ♦ Action de jeter, de lancer en avant (⇒ 1. jet; projeter, I ). Projection de liquide, de vapeur. Lancement, jet (de projectiles). Projection de pierres, d obus.… …   Encyclopédie Universelle

• projection — Pro*jec tion, n. [L. projectio: cf. F. projection.] [1913 Webster] 1. The act of throwing or shooting forward. [1913 Webster] 2. A jutting out; also, a part jutting out, as of a building; an extension beyond something else. [1913 Webster] 3. The… …   The Collaborative International Dictionary of English

• projection — projection, protrusion, protuberance, bulge all denote something which extends beyond a level or a normal outer surface. Projection is applicable to anything that juts out, especially at a sharp angle {buttresses are projections which serve to… …   New Dictionary of Synonyms

• projection — [prō jek′shən, prəjek′shən] n. [MFr < L projectio] 1. a projecting or being projected 2. something that projects, or juts out 3. something that is projected; specif., in map making, the representation on a plane of the earth s surface (or the… …   English World dictionary

• projection — 1550s, originally cartographical, drawing of a map or chart according to scale, from M.Fr. projection, from L. projectionem (nom. projectio), from projicere (see PROJECT (Cf. project) (n.)) …   Etymology dictionary

• projection — [n1] bulge, overhang bump, bunch, eaves, extension, hook, jut, knob, ledge, outthrust, point, prolongation, prominence, protrusion, protuberance, ridge, rim, shelf, sill, spine, spur, step, swelling; concepts 471,509,513 Ant. depression… …   New thesaurus

• projection — Projection. s. f. v. Il n a guere d usage qu en cette phrase, Poudre de projection, qui se dit d une poudre par laquelle les Chymistes pretendent faire le changement des métaux en or …   Dictionnaire de l'Académie française

• Projection — (v. lat.), 1) der Wurf, das Werfen; 2) die Abbildung eines Gegenstandes auf einer ebenen od. krummen Fläche durch gerade Linien, welche sich entweder parallel sind, od. nach einem gegebenen Punkte zusammenlaufen. Wenn auf zwei einander… …   Pierer's Universal-Lexikon

• Projection — Projection, die geometrischen Beziehungen beliebiger Punkte, Linien und Flächen im Raume zu 1, 2 oder 3 sich gegenseitig schneidenden gegebenen Ebenen. Erstere sind die projicirenden Punkte etc., letzteres die P. s od. Coordinatenebenen.… …   Herders Conversations-Lexikon

• projection TV — n. a system made up of lenses, mirrors, and a cathode ray tube, for projecting video images onto a large screen * * * …   Universalium