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Meaning of APERTURE

Pronunciation:  'apurchur

WordNet Dictionary
  1. [n]  an opening; usually small
  2. [n]  a device that controls amount of light admitted
  3. [n]  an opening in something

APERTURE is a 8 letter word that starts with A.


 See Also: camera, embouchure, hole, micropyle, mouthpiece, opening, photographic camera, pore, pupil, regulator, scope, stoma, telescope



Webster's 1913 Dictionary
\Ap"er*ture\ (?; 135), n. [L. apertura, fr. aperire.
See {Aperient}.]
1. The act of opening. [Obs.]

2. An opening; an open space; a gap, cleft, or chasm; a
   passage perforated; a hole; as, an aperture in a wall.

         An aperture between the mountains.    --Gilpin.

         The back aperture of the nostrils.    --Owen.

3. (Opt.) The diameter of the exposed part of the object
   glass of a telescope or other optical instrument; as, a
   telescope of four-inch aperture.

Note: The aperture of microscopes is often expressed in
      degrees, called also the angular aperture, which
      signifies the angular breadth of the pencil of light
      which the instrument transmits from the object or point
      viewed; as, a microscope of 100[deg] aperture.

Video Dictionary
 Definition: Effective Aperture: The apparent diameter of a lens viewed from the position of the object against a diffusely illuminated background, such as a sky. Picture Aperture: The rectangular opening in a metal plate at which each frame of the motion picture film is situated during exposure, printing, or projection. Relative Aperture: The ratio of the focal length of a lens to its effective aperture for an object located at infinity.
Thesaurus Terms
 Related Terms: access, aisle, alley, ambulatory, arcade, artery, avenue, bore, breach, break, broaching, cavity, channel, chasm, check, chink, clearing, cleft, cloister, colonnade, communication, conduit, connection, corridor, covered way, crack, crevice, cut, defile, disclosure, discontinuity, exit, fenestra, ferry, fissure, fistula, fontanel, foramen, ford, gallery, gap, gape, gash, gat, gulf, hiatus, hole, hollow, inlet, interchange, intersection, interstice, interval, junction, lacuna, lane, laying open, leak, opening, opening up, orifice, outlet, overpass, pass, passage, passageway, perforation, pinhole, pore, portico, prick, puncture, railroad tunnel, rupture, slash, slit, slot, space, split, stoma, throwing open, traject, trajet, tunnel, uncorking, underpass, unstopping, vent, yawn