aperture

noun
ap·​er·​ture | \ ˈa-pər-ˌchu̇r How to pronounce aperture (audio) , ˈa-pə-, -chər, -ˌtyu̇r, -ˌtu̇r\

Definition of aperture

1 : an opening or open space : hole entered the cave through a narrow aperture
2a : the opening in a photographic lens that admits the light
b : the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument
c : the diameter of the objective lens or mirror of a telescope

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Synonyms for aperture

Synonyms

hole, opening, orifice, perforation

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Examples of aperture in a Sentence

We entered the cave through a narrow aperture. The photograph was taken using a fast shutter speed and a large aperture.

Recent Examples on the Web

Its Lynx multimode radar is a synthetic aperture radar intended for tracking surface targets on land and sea and for providing ground imaging—but not for searching for other aircraft. Sean Gallagher, Ars Technica, "Top drone: Reaper scores drone kill in air-to-air missile test," 20 Sep. 2018 The five AUVs used in the search are equipped with side-scan sonar, multi-beam echo-sounder for seabed mapping, an HD camera, and synthetic aperture sonar. Sean Gallagher, Ars Technica, "Doomed Argentine sub found a year after its disappearance," 19 Nov. 2018 Next to the standard camera is a 16-megapixel super wide camera with a 107 degree, f/1.9 aperture lens. Dan Seifert, The Verge, "LG V40 ThinQ review: one phone, five cameras," 3 Oct. 2018 More worryingly still for the Europeans, the German Ministry of Defense chose SpaceX to launch three synthetic aperture radar satellites next year instead of an ArianeGroup rocket. Eric Berger, Ars Technica, "As the SpaceX steamroller surges, European rocket industry vows to resist," 20 July 2018 These cans are stunning, but unfortunately the widest has an aperture of only 20.7 inches. Jamie Lauren Keiles, Vox, "Why is it so hard to get rid of cardboard boxes?," 6 Dec. 2018 Microsoft went to a new display design that uses a different transistor, with a smaller pixel but a greater aperture. Mark Hachman, PCWorld, "Microsoft launches next-gen Surface Pro 6, Surface Laptop, Surface Studio and more," 2 Oct. 2018 The Columbia-Class will utilize Virginia-class’ fly-by-wire joystick control system and large-aperture bow array sonar. Fox News, "Navy mulls acceleration of first nuclear-armed Columbia ballistic missile sub," 6 June 2018 However, a telescope with an aperture of at least 6 inches is usually recommended for visual observations of this planet; magnifications of 150 to 200 power should provide the best views. Joe Rao, Space.com, "Mars Makes Its Closest Approach in 15 Years This Summer: How to See It," 29 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'aperture.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of aperture

15th century, in the meaning defined at sense 1

History and Etymology for aperture

Middle English, borrowed from Latin apertūra, from apertus, past participle of aperīre "to open" + -ūra -ure — more at aperient

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Statistics for aperture

Last Updated

1 Mar 2019

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Time Traveler for aperture

The first known use of aperture was in the 15th century

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More Definitions for aperture

aperture

noun

English Language Learners Definition of aperture

formal : a hole or small opening in something
technical : an opening that controls the amount of light that passes through a lens (such as a camera lens)

aperture

noun
ap·​er·​ture | \ ˈa-pər-ˌchu̇r How to pronounce aperture (audio) \

Kids Definition of aperture

: an opening or open space : hole

aperture

noun
ap·​er·​ture | \ ˈap-ə(r)-ˌchu̇(ə)r, -chər, -ˌt(y)u̇(ə)r How to pronounce aperture (audio) \

Medical Definition of aperture

1 : an opening or open space
2 : the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument

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Comments on aperture

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