aperture
noun
ap·er·ture
ˈa-pər-ˌchu̇r 
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
Read more Egypt Giza Pyramid Mystery Addressed by former Egyptian Official
The project used synthetic aperture radar tomography and involved scientists Corrado Malanga of the University of Pisa in Italy and Filippo Biondi of the University of Strathclyde in Scotland.
—
Ron Estes, MSNBC Newsweek, 28 Mar. 2025
Variable aperture lenses can be found on some Huawei and Xiaomi smartphones, but Samsung could make far more marketing noise if the S26 Ultra were to carry this key feature.
—Ewan Spence, Forbes, 21 Mar. 2025
However, according to The Information, at least one of the iPhone 17 models will feature a mechanical aperture, allowing users to adjust the opening of a lens and, thereby, the amount of light entering it manually.
—Jibin Joseph, PCMAG, 12 Mar. 2025
Just a concept at the moment, with the company testing future consumer waters at MWC 2025, the prototyped System marries a 100-megapixel Micro Four Thirds sensor with a 35-mm F1.4 variable aperture lens and manual focus ring.
—Paul Ridden, New Atlas, 3 Mar. 2025
See All Example Sentences for aperture
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Ron Estes, MSNBC Newsweek, 28 Mar. 2025
Variable aperture lenses can be found on some Huawei and Xiaomi smartphones, but Samsung could make far more marketing noise if the S26 Ultra were to carry this key feature.
—Ewan Spence, Forbes, 21 Mar. 2025
However, according to The Information, at least one of the iPhone 17 models will feature a mechanical aperture, allowing users to adjust the opening of a lens and, thereby, the amount of light entering it manually.
—Jibin Joseph, PCMAG, 12 Mar. 2025
Just a concept at the moment, with the company testing future consumer waters at MWC 2025, the prototyped System marries a 100-megapixel Micro Four Thirds sensor with a 35-mm F1.4 variable aperture lens and manual focus ring.
—Paul Ridden, New Atlas, 3 Mar. 2025
See All Example Sentences for aperture
Cite this Entry
“Aperture.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aperture. Accessed 8 Apr. 2025.
Copy CitationKids Definition
aperture
noun
ap·er·ture
ˈap-ə(r)-ˌchu̇(ə)r
-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
ap·er·ture
ˈap-ə(r)-ˌchu̇(ə)r, -chər, -ˌt(y)u̇(ə)r
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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