Aperture definition
The opening, or the diameter of the opening, in a camera, telescope, etc. through which light passes into the lens.
noun
An opening, such as a hole, gap, or slit.
noun
The definition of an aperture is a crevice, hole, or separation.
An example of an aperture is the opening in a camera lense.
noun
An opening; hole; gap.
noun
A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
noun
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The diameter of such an opening, often expressed as an f-number.
noun
The diameter of the objective of a telescope.
noun
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.
noun
(optics) Something which restricts the diameter of the light path through one plane in an optical system.
noun
(astronomy, photography) 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.
noun
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(spaceflight, communication) 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.
noun
(mathematics, rare, of a right circular cone) The maximum angle between the two generatrices.
If the generatrix makes an angle θ to the axis, then the aperture is 2θ.
noun
Other Word Forms
Noun
Singular:
aperture
Plural:
aperturesOrigin of aperture
- Middle English from Latin apertūra from apertus past participle of aperīre to open wer-4 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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From Wiktionary