Dictionary

aperture

noun ap·er·ture \ˈap-ə(r)-ˌchr, -chər, -ˌtyr, -ˌtr\

: 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)

Full Definition of APERTURE

1
:  an opening or open space :  hole
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

  1. We entered the cave through a narrow aperture.
  2. The photograph was taken using a fast shutter speed and a large aperture.

Origin of APERTURE

Middle English, from Latin apertura, from apertus, past participle of aperire to open
First Known Use: 15th century

Other Pictures (on film) Terms

daguerreotype, emulsion, fill, sepia, still, stop
APERTURE Defined for Kids

aperture

noun ap·er·ture \ˈa-pər-ˌchr\

Definition of APERTURE for Kids

:  an opening or open space :  hole
Medical Dictionary

aperture

noun ap·er·ture \ˈap-ə(r)-ˌch(ə)r, -chər, -ˌt(y)(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
July 01, 2015
precarious Hear it
not certain, secure, or steady
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