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
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, 11 Nov. 2024
The large date aperture seems to steal the weight from the 12 o’clock marker, which typically anchors a watch dial along with a logo beneath it.
—Allen Farmelo, Robb Report, 6 Nov. 2024
In the moody, naturally lit film, shot mainly with one lens and one aperture, a veteran Union soldier looks concerned about whether a young recruit can hold up under fire.
—Will Tizard, Variety, 28 Oct. 2024
Those schlocky iris transitions that bookend our glimpses of Jonathan’s timeline, for example, echo the opening and closing of his camera aperture.
—Amanda Whiting, Vulture, 11 Oct. 2024
See all Example Sentences for aperture 
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Jibin Joseph, PCMAG, 11 Nov. 2024
The large date aperture seems to steal the weight from the 12 o’clock marker, which typically anchors a watch dial along with a logo beneath it.
—Allen Farmelo, Robb Report, 6 Nov. 2024
In the moody, naturally lit film, shot mainly with one lens and one aperture, a veteran Union soldier looks concerned about whether a young recruit can hold up under fire.
—Will Tizard, Variety, 28 Oct. 2024
Those schlocky iris transitions that bookend our glimpses of Jonathan’s timeline, for example, echo the opening and closing of his camera aperture.
—Amanda Whiting, Vulture, 11 Oct. 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 29 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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