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
But as that aperture opens, there'll be more arrests nationwide.
—
Elizabeth Pritchett, Fox News, 27 Jan. 2025
Narrowing Clay’s aperture from a do-anything, horizontal solution to one pointed only at growth wasn’t a small step.
—Alex Konrad, Forbes, 22 Jan. 2025
There is also a virtual aperture feature, similar to dSLRs, that gives you real-time control over depth and brightness.
Software: Improved AI for the Real World
The Galaxy S25 line runs Android 15 with the brand-new One UI 7 atop it.
—Iyaz Akhtar, PCMAG, 22 Jan. 2025
Key features: magnification: 8x, aperture: 42 mm, weight: 705g, fog & waterproof, rubber-armored polycarbonate housing, comes with carrying case, lens caps, rain guard, neck strap, and lens cloth.
—Chris McMullen, Space.com, 22 Jan. 2025
See all Example Sentences for aperture 
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Elizabeth Pritchett, Fox News, 27 Jan. 2025
Narrowing Clay’s aperture from a do-anything, horizontal solution to one pointed only at growth wasn’t a small step.
—Alex Konrad, Forbes, 22 Jan. 2025
There is also a virtual aperture feature, similar to dSLRs, that gives you real-time control over depth and brightness.
Software: Improved AI for the Real World
The Galaxy S25 line runs Android 15 with the brand-new One UI 7 atop it.
—Iyaz Akhtar, PCMAG, 22 Jan. 2025
Key features: magnification: 8x, aperture: 42 mm, weight: 705g, fog & waterproof, rubber-armored polycarbonate housing, comes with carrying case, lens caps, rain guard, neck strap, and lens cloth.
—Chris McMullen, Space.com, 22 Jan. 2025
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 2 Feb. 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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