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aperture

Pronunciation: /ˈapətʃə, -tj(ʊ)ə/

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Definition of aperture

noun

an opening, hole, or gap: the bell ropes passed through apertures in the ceiling the genital aperture of an insect
a 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