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WordReference Random House Learner's Dictionary of American English © 2024ap•er•ture /ˈæpɚtʃɚ/USA pronunciation n. [countable]- an opening, such as a hole, slit, or gap.
- OpticsAlso called ˈap•er•ture ˌstop. an opening that limits the amount of light that can enter the lens of a camera or telescope.
WordReference Random House Unabridged Dictionary of American English © 2024ap•er•ture (ap′ər chər),USA pronunciation n. - an opening, as a hole, slit, crack, gap, etc.
- OpticsAlso called ap′erture stop′. an opening, usually circular, that limits the quantity of light that can enter an optical instrument.
- Latin apertūra an opening, equivalent. to apert(us) opened (past participle of aperīre; aper(i)- (see aperient) + -tus past participle suffix) + -ūra -ure
- 1400–50; late Middle English
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