a device that controls amount of light admitted
a natural opening in something
an man-made opening; usually small
An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
Something which restricts the diameter of the light path through one plane in an optical system.
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 100cm aperture.
The maximum angle between the two generatrices.
If the generatrix makes an angle u03B8 to the axis, then the aperture is 2u03B8.
Origin: apertura, from apertus, past participle of aperire, opposed to operire. See aperient.
the act of opening
an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall
the diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture
Origin: [L. apertura, fr. aperire. See Aperient.]
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 the image plane. If an aperture is narrow, then highly collimated rays are admitted, resulting in a sharp focus at the image plane. If an aperture is wide, then uncollimated rays are admitted, resulting in a sharp focus only for rays with a certain focal length. This means that a wide aperture results in an image that is sharp around what the lens is focusing on and blurred otherwise. The aperture also determines how many of the incoming rays are actually admitted and thus how much light reaches the image plane. An optical system typically has many openings, or structures that limit the ray bundles. These structures may be the edge of a lens or mirror, or a ring or other fixture that holds an optical element in place, or may be a special element such as a diaphragm placed in the optical path to limit the light admitted by the system. In general, these structures are called stops, and the aperture stop is the stop that determines the ray cone angle, or equivalently the brightness, at an image point.
Chambers 20th Century Dictionary
a′pėrt-ūr, n. an opening: the space through which light passes in an optical instrument: a hole. [L. apertura—aperīre, to open.]
Dictionary of Nautical Terms
In astronomy, the opening of a telescope tube next the object-glass, through which the rays of light and image of the object are conveyed to the eye. It is usually estimated by the clear diameter of the object-glass.
The numerical value of aperture in Chaldean Numerology is: 6
The numerical value of aperture in Pythagorean Numerology is: 5
Examples of aperture in a Sentence
You need to widen the aperture of where you're looking.
The upper lip must never tremble. Some fear to be abused and have their identity destroyed, if they make an aperture in the curtain of their emotions. (“The upper lip must never tremble”)
Renaming PACOM is ultimately a symbolic act ... (it) will have a very limited impact unless the U.S. follows through with a significant array of initiatives and investments that reflect a wider aperture.
If I'm playing a horn arrangement on keyboard, or strings, it sounds like strings or horns, 'cause I know how to phrase it, how a string phrases, different attacks from the aperture for horns, trumpets, sax or trombones.
The truth of it is Trump has shown... that there's a strong appetite for bold solutions to significant problems, trump's disruption, and many of his lunatic ideas, have widened the aperture of what's acceptable in the policy debates.
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Translations for aperture
From our Multilingual Translation Dictionary
- отверстие, отвор, апертураBulgarian
- Blendenzahl, Blende, ÖffnungGerman
- apertura, aberturaSpanish
- aukko, reikäFinnish
- ხვრელი, სანათური, ჭუჭრუტანა, ნაპრალიGeorgian
- opening, diafragmaDutch
- szpara, szczelina, przesłona, otwór, przysłonaPolish
- диафрагма, отверстие, апертураRussian
- bländare, öppningSwedish
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