Aperture - Definitions from Dictionary.com

7 results for: Aperture

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

ap·er·ture

Audio Help [ap-er-cher] Pronunciation Key

–noun

1.	an opening, as a hole, slit, crack, gap, etc.

2.	Also called aperture stop. Optics. an opening, usually circular, that limits the quantity of light that can enter an optical instrument.

[Origin: 1400–50; late ME < L apertūra an opening, equiv. to apert(us) opened (ptp. of aperīre; aper(i)- (see aperient) + -tus ptp. suffix) + -ūra -ure

]

—Related forms

ap·er·tur·al

Audio Help [ap-er-choo

r-uh

l] Pronunciation Key, adjective

ap·er·tured, adjective

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Aperture

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American Heritage Dictionary - Cite This Source - Share This

ap·er·ture Audio Help (āp'ər-chər) Pronunciation Key
n.

An opening, such as a hole, gap, or slit.
1. 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.
2. The diameter of such an opening, often expressed as an f-number.
3. The diameter of the objective of a telescope.

[Middle English, from Latin apertūra, from apertus, past participle of aperīre, to open; see wer-⁴ in Indo-European roots.]

ap'er·tur'al adj.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

Online Etymology Dictionary - Cite This Source - Share This
aperture

1649, from L. apertura, from apertus, pp. of aperire "to open" (see overt).

WordNet - Cite This Source - Share This

aperture
noun
1.	a device that controls amount of light admitted
2.	a natural opening in something
3.	an man-made opening; usually small

Kernerman English Multilingual Dictionary - Cite This Source - Share This
aperture1 [ˈӕpətjuə] noun

an opening or hole

Arabic:	ثُقْب، فَتْحَه
Chinese (Simplified):	孔
Chinese (Traditional):	孔
Czech:	otvor, díra
Danish:	åbning; hul
Dutch:	opening
Estonian:	ava
Finnish:	aukko
French:	ouverture
German:	die Öffnung
Greek:	άνοιγμα, τρύπα
Hungarian:	rés
Icelandic:	gat, op
Indonesian:	celah, lobang
Italian:	apertura

Japanese:	開き口
Korean:	구멍
Latvian:	caurums; sprauga
Lithuanian:	plyšys
Norwegian:	åpning, hull
Polish:	otwór
Portuguese (Brazil):	abertura
Portuguese (Portugal):	abertura
Romanian:	deschizătură
Russian:	отверстие
Slovak:	otvor
Slovenian:	odprtina
Spanish:	abertura
Swedish:	öppning, glugg, hål
Turkish:	delik

aperture2 [ˈӕpətjuə] noun

(the size of) the opening (eg in a camera) through which light passes

Arabic:	فَتْحَة عَدَسَة الكاميرا
Chinese (Simplified):	孔径
Chinese (Traditional):	孔徑
Czech:	clona
Danish:	blændeåbning; apertur
Dutch:	lensopening
Estonian:	ava
Finnish:	aukko
French:	ouverture
German:	die Blende
Greek:	άνοιγμα
Hungarian:	lencsenyílás, rekesz
Icelandic:	ljósop
Indonesian:	bukaan lubang lensa
Italian:	apertura

Japanese:	しぼり
Korean:	(렌즈의) 구경
Latvian:	atvērums
Lithuanian:	diafragma
Norwegian:	blender(åpning)
Polish:	przysłona
Portuguese (Brazil):	abertura
Portuguese (Portugal):	abertura
Romanian:	deschizătură
Russian:	апертура
Slovak:	svetelnosť
Slovenian:	zaslonka
Spanish:	abertura
Swedish:	bländare, bländaröppning
Turkish:	diyafram açıklığı, aralık, yarık

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Aperture

An"gu*lar\, a. [L. angularis, fr. angulus angle, corner. See Angle.]

1. Relating to an angle or to angles; having an angle or angles; forming an angle or corner; sharp-cornered; pointed; as, an angular figure.

2. Measured by an angle; as, angular distance.

3. Fig.: Lean; lank; raw-boned; ungraceful; sharp and stiff in character; as, remarkably angular in his habits and appearance; an angular female.

Angular aperture, Angular distance. See Aperture, Distance.

Angular motion, the motion of a body about a fixed point or fixed axis, as of a planet or pendulum. It is equal to the angle passed over at the point or axis by a line drawn to the body.

Angular point, the point at which the sides of the angle meet; the vertex.

Angular velocity, the ratio of anuglar motion to the time employed in describing.

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