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Aperture

//ˈap.ə.t͡ʃə// noun

Definitions

Noun

1
A small or narrow opening, gap, slit, or hole.
"an aperture in a wall"
2
an man-made opening; usually small wordnet
3
A hole which restricts the diameter of the lightpath through one plane in an optical system.
4
a device that controls amount of light admitted wordnet
5
A hole which restricts the diameter of the lightpath through one plane in an optical system.; The diameter of such a hole which restricts the width of the lightpath through the whole system. For a telescope, this is the diameter of the objective lens.
"This telescope has a 100 cm aperture."

Show 3 more definitions

6
a natural opening in something wordnet
7
The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
8
The maximum angle between the two generatrices. rare
"If the generatrix makes an angle θ to the axis, then the aperture is 2θ."

Etymology

From late Middle English, from Latin apertūra (“an opening”), from aperiō (“to uncover, make or lay bare”) + -tūra (“-ure”, action noun suffix). Doublet of overture.

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