aperture.
A small or narrow opening, gap, slit, or hole.
Meaning & usage
A small or narrow opening, gap, slit, or hole.
an aperture in a wall
A hole which restricts the diameter of the lightpath through one plane in an optical system.
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.
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.
The maximum angle between the two generatrices.
If the generatrix makes an angle θ to the axis, then the aperture is 2θ.
Where this word comes from
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 and apertura.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.