How do you spell Aperture

Available Definitions:
1)  n. - The act of opening.
2)  n. - An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
3)  n. - The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.





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