aperture

noun

ap·​er·​ture ˈa-pər-ˌchu̇r How to pronounce aperture (audio)
ˈa-pə-,
-chər,
-ˌtyu̇r,
-ˌtu̇r
1
: an opening or open space : hole
entered the cave through a narrow aperture
2
a
: 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

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 By opening the aperture and seeking out talent beyond their traditional sourcing pools, AST unlocked an even greater level of customer satisfaction and achievement. Caitlyn Brazill, Forbes, 29 Feb. 2024 The simplicity of the camera, with a pin-sized hole in a thin 24-karat gold sheet as the aperture, minimizes potential mechanical failures. The Arizona Republic, 28 Feb. 2024 Mirroring former series models, the watch also features a tachymeter scale along its outer rim, as well as a date aperture at 6 o’clock. Demetrius Simms, Robb Report, 14 Nov. 2023 In August, China launched a synthetic aperture radar surveillance satellite into a geosynchronous-type orbit using a medium-lift Long March 7 rocket. Stephen Clark, Ars Technica, 15 Dec. 2023 Just over thirty years ago, the NASA probe Magellan went to Venus, deploying synthetic aperture radar to scan the planet surface. IEEE Spectrum, 24 Nov. 2023 Scene Partners begins with a towering video of her face on the collection of LED screens that open and shut like a camera aperture across the front of Riccardo Hernández’s set. Sara Holdren, Vulture, 16 Nov. 2023 Losing a stop or two of light with an F5-6.3 zoom is significant, especially since Micro Four Thirds lenses show less resolution at apertures narrower than f/8. PCMAG, 1 Feb. 2024 The aperture of the Israeli campaign widened, reaching Gaza’s south. Ishaan Tharoor, Washington Post, 9 Jan. 2024 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'aperture.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

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

First Known Use

15th century, in the meaning defined at sense 1

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

Dictionary Entries Near aperture

Cite this Entry

“Aperture.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aperture. Accessed 4 Mar. 2024.

Kids Definition

aperture

noun
ap·​er·​ture ˈap-ə(r)-ˌchu̇(ə)r How to pronounce aperture (audio)
-chər
1
: an opening or open space : hole
2
a
: the opening in a camera lens that allows light through
b
: the diameter of the opening in a camera lens

Medical Definition

aperture

noun
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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