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
The selfie camera improves year over year from 8MP to 16MP with an aperture of f/2.4.
—
PCMAG, 30 Jan. 2025
The camera software also features a slew of tiny changes like support for a virtual aperture mode when using Expert RAW, better noise reduction, 10-bit HDR, new generative AI features, and more.
—Prakhar Khanna, Forbes, 22 Jan. 2025
Widening the aperture through which leaders see growth is not simply an interesting intellectual challenge but also a practical one.
—Saadia Zahidi, Foreign Affairs, 17 Jan. 2025
The large aperture at 6 o’clock reveals the tourbillon in stunning detail with the Maltese cross bridge design in full view.
—Blake Buettner, Robb Report, 10 Jan. 2025
See all Example Sentences for aperture 
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PCMAG, 30 Jan. 2025
The camera software also features a slew of tiny changes like support for a virtual aperture mode when using Expert RAW, better noise reduction, 10-bit HDR, new generative AI features, and more.
—Prakhar Khanna, Forbes, 22 Jan. 2025
Widening the aperture through which leaders see growth is not simply an interesting intellectual challenge but also a practical one.
—Saadia Zahidi, Foreign Affairs, 17 Jan. 2025
The large aperture at 6 o’clock reveals the tourbillon in stunning detail with the Maltese cross bridge design in full view.
—Blake Buettner, Robb Report, 10 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 13 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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