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
If using a regular camera, Adobe suggests setting the focus to the farthest possible setting with a wide aperture, lower shutter speed and a high ISO value.
—
Ty Roush, Forbes, 5 Nov. 2024
The company operates the world's largest constellation of synthetic aperture radar (SAR) satellites.
—David Faris, Newsweek, 4 Nov. 2024
Once Russia invades Ukraine, the already narrowing aperture through which its subjects were able to broadcast the truth irises closed completely.
—Alison Willmore, Vulture, 5 Oct. 2024
Nestled between sub-dials is a triangular aperture which fills with red when the power reserve is below 10 hours.
—Allen Farmelo, Robb Report, 13 Sep. 2024
See all Example Sentences for aperture 
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Ty Roush, Forbes, 5 Nov. 2024
The company operates the world's largest constellation of synthetic aperture radar (SAR) satellites.
—David Faris, Newsweek, 4 Nov. 2024
Once Russia invades Ukraine, the already narrowing aperture through which its subjects were able to broadcast the truth irises closed completely.
—Alison Willmore, Vulture, 5 Oct. 2024
Nestled between sub-dials is a triangular aperture which fills with red when the power reserve is below 10 hours.
—Allen Farmelo, Robb Report, 13 Sep. 2024
See all Example Sentences for aperture
Dictionary Entries Near aperture
Cite this Entry
“Aperture.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aperture. Accessed 22 Nov. 2024.
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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