aperture

4 ENTRIES FOUND:

ap·er·ture

noun
\ˈap-ə(r)-ˌch(ə)r, -chər, -ˌt(y)(ə)r\

Definition of APERTURE

1
: an opening or open space
2
: the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument

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