Definition of Projiction
Pro*jec"tion (?), n. [L.
projectio: cf. F. projection.]
1. The act of throwing or shooting
forward.
2. A jutting out; also, a part jutting out, as
of a building; an extension beyond something else.
3. The act of scheming or planning; also, that
which is planned; contrivance; design; plan.
Davenant.
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.
5. (Geog.) Any method of representing
the surface of the earth upon a plane.
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.
Syn. -- See Protuberance.
- Webster's Unabridged Dictionary (1913)
- something which projects, protrudes, juts out, sticks out, or stands out
The face of the cliff had many projections big enough for birds to nest on.
- a forecast or prognosis obtained by extrapolation
- The Nuttall Encyclopedia
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