(n) :
an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall; something which restricts the diameter of the light path through one plane in an optical system
"an aperture between the mountains. --Gilpin."
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(n) :
an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall; something which restricts the diameter of the light path through one plane in an optical system