Meaning of APERTURE in English


Pronunciation: ' ap- ə (r)- ˌ chu ̇ r, -ch ə r, - ˌ tyu ̇ r, - ˌ tu ̇ r

Function: noun

Etymology: Middle English, from Latin apertura, from apertus, past participle of aperire to open

Date: 15th century

1 : an opening or open space : HOLE

2 a : the opening in a photographic lens that admits the light b : the diameter of the stop in an optical system that determines the diameter of the bundle of rays traversing the instrument c : the diameter of the objective lens or mirror of a telescope

Merriam Webster Collegiate English Dictionary.      Merriam Webster - Энциклопедический словарь английского языка.