Definition of Aperture

1. Noun. A device that controls amount of light admitted.

Group relationships: Camera, Photographic Camera, Scope, Telescope
Generic synonyms: Regulator

2. Noun. A natural opening in something.
Group relationships: Eye, Oculus, Optic
Specialized synonyms: Pupil, Micropyle, Pore, Stoma, Stomate
Generic synonyms: Hole

3. Noun. An man-made opening; usually small.
Specialized synonyms: Embouchure, Mouthpiece, Mouthpiece
Generic synonyms: Opening

Definition of Aperture

1. n. The act of opening.

Definition of Aperture

1. Noun. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. ¹

2. Noun. (optics) Something which restricts the diameter of the light path through one plane in an optical system. ¹

3. Noun. (context: 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. ¹

4. Noun. (mathematics rare of a right circular cone) The maximum angle between the two generatrices. ¹

¹ Source:

Definition of Aperture

1. an opening [n -S] - See also: opening

Medical Definition of Aperture

1. 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)

Aperture Pictures

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Lexicographical Neighbors of Aperture

apertura externa aqueductus vestibuli
apertura externa canaliculi cochleae
apertura lateralis ventriculi quarti
apertura mediana ventriculi quarti
apertura piriformis
apertura sinus frontalis
apertura sinus sphenoidalis
apertura thoracis inferior
apertura thoracis superior
apertura tympanica canaliculi chordae tympani
aperture (current term)
aperture correction
aperture diaphragm
aperture for electron microscopy
aperture function
aperture membrane
aperture of mastoid antrum
aperture of orbit
aperture plane

Literary usage of Aperture

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Mechanism of Speech: Lectures Delivered Before the American Association by Alexander Graham Bell (1906)
"Back divided-aperture, Voice. The second symbol in the second line, ... For the sake of symmetry another small " Back centre-aperture" is attached to the ..."

2. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1890)
"Theory of Circular aperture. V.'u will now consider the important case where the form of the •perture ia circular. Writing for brevity *tl/-P, «чУ-î we hare ..."

3. The Stones of Venice by John Ruskin (1851)
"WE have hitherto considered the aperture as merely pierced in the thickness of the walls ; and when its masonry is simple and the fillings of the aperture ..."

4. The Microscope and its revelations by William Benjamin Carpenter (1881)
"Abbe himself in his Paper ' On the Estimation of aperture,' and the other by his disciple, Mr. Prank Crisp (one of the Secretaries of the Royal ..."

5. Journal of the Royal Microscopical Society by Royal Microscopical Society, London (1882)
"The Relation of aperture and Power in the Microscope (continued).9 By Professor ... The Rational Balance of aperture and Power. The question we have now to ..."

6. The Young Mill-wright and Miller's Guide by Oliver Evans, Thomas P. Jones, Cadwallader Evans (1848)
"The friction of an aperture of any regular or irregular figure, is as the length of the sum of the circumscribing lines, nearly; the quantities being as the ..."

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