aperture

  1. a device that controls amount of light admitted
  2. an opening in something
  3. an opening; usually small

aperture

A predetermined shape (round, square, oblong, etc.), size (width, diameter), and type (draw or flash) that is exposed on artwork film by a photoplotter.
Found on http://www.encyclo.co.uk/local/20870

Aperture

In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane. The aperture determines how collimated the admitted rays are, which is of great importance for the appearance at ...
Found on http://en.wikipedia.org/wiki/Aperture

Aperture

is a hole, gap, or slit and any other small opening. Diameter of the objective of a telescope.
Found on http://planetfacts.org/space-terms/

Aperture

- The variable diameter opening in a camera lens that allows control of the intensity of light reaching the CCD. A camera's aperture and shutter speed determine a photo's exposure. Aperture diameters are expressed in f-numbers, e.g., f/11. As the f-number increases, the lens opening decreases. The lens opening, which is adjustable, allows more or l...
Found on http://www.encyclo.co.uk/local/21026

aperture

(ap´әr-chәr) opening. numerical aperture an expression of the measure of efficiency of a microscope objective.
Found on http://www.encyclo.co.uk/local/21001

Aperture

(Digital cameras and photo printers) Mechanism behind the lens that controls the amount of light entering the camera. The aperture not only influences picture brightness but also regulates depth of focus. Most cameras are equipped with an iris aperture that can be freely adjusted or set according to pre-selected values.
Found on http://www.encyclo.co.uk/local/20472

aperture

(from the article `gastropod`) ...pattern around a central axis called the columella. Generally, the coils, or whorls, added later in life are larger than those added when the ...
Found on http://www.britannica.com/eb/a-z/a/87

aperture

[n] - an opening in something 2. [n] - a device that controls amount of light admitted 3. [n] - an opening
Found on http://www.webdictionary.co.uk/definition.php?query=aperture

Aperture

• (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture. • (n.) An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. • (n.) The act of opening.
Found on http://thinkexist.com/dictionary/meaning/aperture/

aperture

<physics> The opening in an optical system which restricts the size of the bundle of rays incident on a given surface. (Usually circular and specified by diameter.) ... (09 Oct 1997) ...
Found on http://www.encyclo.co.uk/local/20973

aperture

noun an man-made opening; usually small
Found on http://wordnetweb.princeton.edu/perl/webwn?s=aperture

Aperture

[botany] Apertures are areas on the walls of a pollen grain, where the wall is thinner and/or softer. For germination it is necessary that the pollen tube can reach out from the inside of the pollen grain and transport the sperm to the egg deep down in the pistil. The apertures are the places where the pollen tube is able to break through t...
Found on http://en.wikipedia.org/wiki/Aperture_(botany)

Aperture

[computer memory] In computing, an aperture is a portion of memory physical address space which is persistently{clarification needed|date=January 2012} associated with a particular peripheral device or a memory unit. Apertures may reach external devices such as ROM or RAM chips, or internal memory on the CPU itself. Typically a memory devic...
Found on http://en.wikipedia.org/wiki/Aperture_(computer_memory)

Aperture

[magazine] Aperture is a quarterly photography magazine published by Aperture Foundation, a non-profit organization devoted to fine art photography and based in New York, NY. ==Aperture magazine== Inspired by the production quality of Alfred Stieglitz`s then defunct Camera Work, Aperture magazine was founded by Minor White, Ansel Adams, Dor...
Found on http://en.wikipedia.org/wiki/Aperture_(magazine)

Aperture

[mollusc] The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc. The term aperture is used for the main opening in gastropod shells, scaphopod shells, and also for Nautilus and ammonite shells. The word is no...
Found on http://en.wikipedia.org/wiki/Aperture_(mollusc)

Aperture

Ap'er·ture noun [ Latin apertura , from aperire . See Aperient .] 1. The act of opening. [ Obsolete] 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 moun...
Found on http://www.encyclo.co.uk/webster/A/101

Aperture

A hole through which radiant energy can pass. Angular aperture is the angle through which the most divergent rays can pass through a hole or lens. The aperture of a lens is often expressed in terms of an f/#. The f/# is the ratio of the focal length of the lens to its diameter. A lens with a focal length of 100mm and a diameter of 25mm would have a...
Found on http://www.intl-lighttech.com/support/glossary

aperture

A hole. The circular hole in the centre of a lens through which light passes to reach the film. The size of the hole can be varied using the aperture control which in turn alters a diaphragm within the body of the lens. Measured in f-stops. Altering by one F-stop either halves or doubles the amount of light reaching the film.
Found on http://www.silverlight.co.uk/resources/glossarynz.html

Aperture

A measure of the physical space available for beam to occupy in a device. Aperture limitations, however, are not always due to the physical size of the vacuum chamber; for instance, a magnetic field anomaly may deflect the beam so that the full available aperture cannot be used.
Found on http://www-bdnew.fnal.gov/operations/accgloss/gloss.html

Aperture

A measure of the width of the opening allowing light to enter a camera.
Found on http://www.nyfa.edu/students/resources/film-glossary.php

APERTURE

A measure of the width of the opening allowing light to enter a camera.
Found on https://www.nyfa.edu/student-resources/glossary/

Aperture

A relatively large opening on the last-formed chamber of a foraminiferal shell.
Found on http://geology.er.usgs.gov/paleo/glossary.shtml

Aperture

A small, circular opening inside the lens that can change in diameter to control the amount of light
Found on http://www.superglossary.com/Glossary/Technology/Digital_Cameras/

Aperture

A thin (
Found on http://www.unl.edu/CMRAcfem/glossary.htm
No exact match found