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
Along with a 50-megapixel main camera with autofocus and a F1/8 aperture is an ultra-wide actioncam built around a 1/2-inch-type IMX586 imaging sensor.
—
Paul Ridden
may 17, New Atlas, 17 May 2026
Wide-angle lenses and low apertures are also ideal for shooting photos of the aurora.
—Antonio Pequeño Iv, Forbes.com, 16 May 2026
Of course, the film quickly became a conduit for Harari’s own concerns, made all the more resonant once the narrative aperture widens to reveal that its central soul-swap may be only one of many.
—Ben Croll, IndieWire, 15 May 2026
The front dial adjusts aperture, the left rear dial changes the shutter speed, and the right rear dial sets exposure compensation (EV).
—Jim Fisher, PC Magazine, 13 May 2026
See All Example Sentences for aperture
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Paul Ridden
may 17, New Atlas, 17 May 2026
Wide-angle lenses and low apertures are also ideal for shooting photos of the aurora.
—Antonio Pequeño Iv, Forbes.com, 16 May 2026
Of course, the film quickly became a conduit for Harari’s own concerns, made all the more resonant once the narrative aperture widens to reveal that its central soul-swap may be only one of many.
—Ben Croll, IndieWire, 15 May 2026
The front dial adjusts aperture, the left rear dial changes the shutter speed, and the right rear dial sets exposure compensation (EV).
—Jim Fisher, PC Magazine, 13 May 2026
See All Example Sentences for aperture
Cite this Entry
“Aperture.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aperture. Accessed 21 May. 2026.
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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