Definition of aperture Aperture

/æˈpɚʧɚ/ - [atpercher] - ap•er•ture

We found 15 definitions of aperture from 7 different sources.

What does aperture mean?

Noun Plural: apertures
aperture - a natural opening in something
		hole an opening deliberately made in or through something
		oculus, optic, eye a small hole or loop (as in a needle); "the thread wouldn't go through the eye"
		pupil the contractile aperture in the center of the iris of the eye; resembles a large black dot
		micropyle minute opening in the wall of an ovule through which the pollen tube enters
aperture - an man-made opening; usually small
		opening the act of opening something; "the ray of light revealed his cautious opening of the door"
		embouchure, mouthpiece the aperture of a wind instrument into which the player blows directly
aperture - a device that controls amount of light admitted
		regulator any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
		photographic camera, camera equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other)

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aperture (Noun)
An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
aperture (Noun)
Something which restricts the diameter of the light path through one plane in an optical system.
aperture (Noun)
The diameter of the aperture in the sense above which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e. g. a telescope may have a 100 cm aperture.
aperture (Noun)
The typically large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna ; sometimes called an array.
aperture (Noun)
The maximum angle between the two generatrices.

aperture (n.)
The act of opening.
aperture (n.)
An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
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.

aperture
In photography, the camera lens opening and its relative diameter. Measured in f-stops, such as f/8, etc. As the number increases, the size of the aperture decreases, thereby reducing the amount of light passing through the lens and striking the film. (source: Ackland Art Museum)

aperture
a′pėrt-ūr, n. an opening: the space through which light passes in an optical instrument: a hole. [L. apertura—aperīre, to open.]

In Optics (and also photography) an Aperture is a hole where light can pass through.

In photography.

The aperture stop of a photographic lens can be adjusted to control the amount of light reaching the film or image sensor. In combination with variation of shutter speed, the aperture size will regulate the film's degree of exposure to light. Typically, a fast shutter speed will require a larger aperture to ensure sufficient light exposure, and a slow shutter speed will require a smaller aperture to avoid excessive exposure.