aperture

noun
ap·​er·​ture | \ ˈa-pər-ˌchu̇r How to pronounce aperture (audio) , ˈa-pə-, -chər, -ˌtyu̇r, -ˌtu̇r \

Definition of aperture

1 : an opening or open space : hole entered the cave through a narrow aperture
2a : 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

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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 This option features a wide, 70 millimeter aperture that will make stars and constellations appear bright and clear. Jennifer Leman, Popular Mechanics, "We've Found Possible Signs of Life in Venus's Clouds. Whoa.," 14 Sep. 2020 This option features a wide, 70 millimeter aperture that will make stars and constellations appear bright and clear. Jennifer Leman, Popular Mechanics, "Two Black Holes Smashed and Completely Changed What We Know About the Universe," 8 Sep. 2020 Mercedes has achieved this using an LCD screen with an LCD grille aperture. Roberto Baldwin, Car and Driver, "Mercedes Floods 2021 S-Class with New and Updated Technology," 2 Sep. 2020 And with all that resolution, a super-wide aperture, and a somewhat large sensor, focusing is actually important with a camera module like this. Popular Science, "The Samsung Galaxy Note20 Ultra 5G has one of the best screens you can cram in your pocket," 18 Aug. 2020 This reflector telescope’s 5.1-inch aperture can gather lots of light for great telescopic views, and its shorter frame offers easy portability. Dana Holmes, CNN Underscored, "A beginner’s guide to stargazing," 18 Aug. 2020 There is a Pro Mode to give the videographer control over aperture, shutter speed, microphone placement, zoom speed, auto focus, exposure compensation and white balance. Dallas News, "First Look: Samsung Galaxy Note20 5G Ultra," 13 Aug. 2020 For the perfect exposure, Shih says it’s usually best to use a larger aperture, slow shutter speed, and appropriate ISO setting. Stacey Leasca, Travel + Leisure, "How to Photograph Fireflies on Your iPhone Like a Professional," 11 July 2020 The system uses the traditional LCD display combined with an LCD aperture grille that sits a few millimeters ahead of the display. Roberto Baldwin, Car and Driver, "2021 Mercedes-Benz S-Class Gets Updated Infotainment, 3D Display," 8 July 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'aperture.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of aperture

15th century, in the meaning defined at sense 1

History and Etymology for aperture

Middle English, borrowed from Latin apertūra, from apertus, past participle of aperīre "to open" + -ūra -ure — more at aperient

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Time Traveler for aperture

Time Traveler

The first known use of aperture was in the 15th century

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Statistics for aperture

Last Updated

26 Sep 2020

Cite this Entry

“Aperture.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aperture. Accessed 29 Sep. 2020.

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More Definitions for aperture

aperture

noun
How to pronounce aperture (audio)

English Language Learners Definition of aperture

formal : a hole or small opening in something
technical : an opening that controls the amount of light that passes through a lens (such as a camera lens)

aperture

noun
ap·​er·​ture | \ ˈa-pər-ˌchu̇r How to pronounce aperture (audio) \

Kids Definition of aperture

: an opening or open space : hole

aperture

noun
ap·​er·​ture | \ ˈap-ə(r)-ˌchu̇(ə)r, -chər, -ˌt(y)u̇(ə)r How to pronounce aperture (audio) \

Medical Definition of aperture

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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Comments on aperture

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