Noun
The act of opening.
An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.
Source: Webster's dictionaryThere are many hypotheses in science which are wrong. That's perfectly all right: it's the aperture to finding out what's right. Science is a self-correcting process. Carl Sagan
There is a moon shaped rictus in the streetlamp's globe where a stone has gone and from this aperture there drifts down through the constant helix of aspiring insects a faint and steady rain of the same forms burnt and lifeless. Cormac McCarthy
You are an aperture through which the universe is looking at and exploring itself. Alan Watts
I've started to see this community as a real resource in America. I have described them as "narrow-minded idealists." If you can widen the aperture of that idealism, these people want to change the world. They want their lives to have meaning. Bono
A 100 mm aperture reflecting telescope collected light and directed it to a series of filters, and, from there, measurements were performed by the detectors of the PPR. Source: Internet
Additionally, Amplitude modulators can be constructed by deflecting the beam into and out of a small aperture such as a fiber. Source: Internet