aperture

noun ap·er·ture \ ˈa-pər-ˌchu̇r , ˈa-pə- , -chər , -ˌtyu̇r , -ˌtu̇r \

Definition of aperture

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

  1. We entered the cave through a narrow aperture.

  2. The photograph was taken using a fast shutter speed and a large aperture.

Recent Examples of aperture from the Web

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.

Origin and Etymology of aperture

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

Other Pictures (on film) Terms


APERTURE Defined for English Language Learners

aperture

noun

Definition of aperture for English Language Learners

  • : 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 Defined for Kids

aperture

noun ap·er·ture \ ˈa-pər-ˌchu̇r \

Definition of aperture for Students

:an opening or open space :hole

Medical Dictionary

aperture

noun ap·er·ture \ ˈap-ə(r)-ˌchu̇(ə)r, -chər, -ˌt(y)u̇(ə)r \

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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