Definition of aperture in English:

Share this entry


Pronunciation: /ˈapətʃə/
Pronunciation: /ˈapətj(ʊ)ə/


1An opening, hole, or gap: the bell ropes passed through apertures in the ceiling the genital aperture of an insect
More example sentences
  • Measure the height and width of the aperture, the distance between the bolt holes, and the overall size of the previous fitting.
  • Some joints are already beginning to crumble and in other cases, the jointing mix was only applied as a veneer to the top of the joint aperture leaving a cavity underneath.
  • Together, this indicates that the length is about twice as long as the width and the apertures appear more slit-like than round holes.
1.1A space through which light passes in an optical or photographic instrument, especially the variable opening by which light enters a camera: a refracting telescope with an aperture of 3 inches
More example sentences
  • Even an in-focus image will exhibit some blurring due to the diffraction of light from the camera aperture.
  • There is, admittedly, a tradeoff - as in the photographic camera - between aperture and depth of field.
  • The Wide lens is also the one you should use in low light situations, such as twilight, as most Wide lenses have larger apertures which let more light in to the camera.



Example sentences
  • Aperture is a simple opening in the center of the apertural face.
  • The two species differ in the ornamentation of the apertural margin.
  • Thus, the presence or absence of an apertural slit does not necessarily have significance for high-level taxonomy.


Late Middle English: from Latin apertura, from apert- 'opened', from aperire 'to open'.

  • This is from Latin apertura from aperire ‘to open’.

For editors and proofreaders

Line breaks: aper|ture

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.