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

Keep scrolling for more

Synonyms for aperture

Synonyms

Visit the Thesaurus for More 

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 dash cam also utilizes a powerful Sony IMX323 sensor, four IR LED lights, and f/1.4 and 1.8 aperture to provide crystal clear night vision. Chris Hachey, BGR, 9 Sep. 2021 A day at the races offers just one aperture into Mauritian culture, beyond the balmy beach resorts. Mary Holland, Robb Report, 4 Sep. 2021 Beyond optical imaging, companies like Cappella Space and Iceye enable a wide range of capabilities from object detection to flood depth measurements using synthetic aperture radar (SAR). Rachel Olney, Forbes, 1 Sep. 2021 Artist James Turrell is building one of his iconic Skyspaces, a room with a roof aperture that transforms the blue yonder into a natural canvas. Condé Nast Traveler, 12 Aug. 2021 The power to determine the purpose of education and codify what is worthy of study was wielded by white men, who viewed education through a white aperture. Melissa Gira Grant, The New Republic, 9 Aug. 2021 However, increasing the pixel count or switching to a wider aperture can dramatically reduce this effect. Paul Monckton, Forbes, 28 June 2021 The telescope China hopes to build, says Deng, could have an aperture—the diameter of the telescope’s light-gathering lens or mirror—of 100 feet and be the world’s largest, at least for a short time. Corryn Wetzel, Smithsonian Magazine, 19 Aug. 2021 Bergman then overlaid synthetic aperture radar and optical imagery from the European Space Agency’s Sentinel-1 and -2 satellites onto the suspicious AIS pings. Mark Harris, Wired, 29 July 2021

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.

See More

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

Keep scrolling for more

Buying Guide

Our team at The Usage has selected the best digital cameras of 2021.

Learn More About aperture

Time Traveler for aperture

Time Traveler

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

See more words from the same century

Dictionary Entries Near aperture

apertural canal

aperture

aperture card

See More Nearby Entries 

Statistics for aperture

Last Updated

15 Sep 2021

Cite this Entry

“Aperture.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aperture. Accessed 26 Sep. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for aperture

aperture

noun

English Language Learners Definition of aperture

: a hole or small opening in something
: 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

More from Merriam-Webster on aperture

Nglish: Translation of aperture for Spanish Speakers

Britannica English: Translation of aperture for Arabic Speakers

Britannica.com: Encyclopedia article about aperture

WORD OF THE DAY

Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!