aperture

nounB1

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Danh từ

noun

Plural noun:

apertures

1.
A small or narrow opening, gap, slit, or hole.
an aperture in a wall
2.
(optics) A hole which restricts the diameter of the lightpath through one plane in an optical system.
3.
(space flight, communication) 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.
4.
(rare)(mathematics, rare, of a right circular cone) The maximum angle between the two generatrices.
If the generatrix makes an angle θ to the axis, then the aperture is 2θ.

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Nguồn gốc từ

From late Middle English -, from Latin apertūra (an opening), from aperiō + -tūra. overture and apertura.