from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An opening, such as a hole, gap, or slit.
- n. A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
- n. The diameter of such an opening, often expressed as an f-number.
- n. The diameter of the objective of a telescope.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
- n. Something which restricts the diameter of the light path through one plane in an optical system.
- n. The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens. e.g. a telescope may have a 100 cm aperture.
- n. The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
- n. The maximum angle between the two generatrices.
from the GNU version of the Collaborative International Dictionary of English
- n. The act of opening.
- n. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole.
- n. The diameter of the exposed part of the object glass of a telescope or other optical instrument.
from The Century Dictionary and Cyclopedia
- n. The act of opening out or unfolding.
- n. An opening; a hole, orifice, gap, cleft, or chasm; a passage or perforation; any direct way for ingress or egress.
- n. In geometry, the space between two intersecting right lines.
- n. In optics, the diameter of the exposed part of the object-glass in a telescope or other optical instrument.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a device that controls amount of light admitted
- n. an man-made opening; usually small
- n. a natural opening in something
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In retailing the size of the aperture is often used to provide shoppers with clues about what is in a store.
If in the walls surrounding this cavity a small aperture is made through which radiation issues, we obtain a radiation which is independent of the nature of the emitting body, and is wholly determined by the temperature.
The aperture is 20 ft. wide, and is still widening.
Josh: Well, we basically just looked up various words for different meanings and came up with the word aperture, which means an opening through which light is emitted.
I was reading through a section of my post from yesterday this afternoon and noticed that I called aperture apenture.
a part of this stream of air, on each side of the edge of the aperture is perpetually stopped by that edge; and thus
The aperture is a window, and it seems to me that we’re hoping for a door; a way to Be in Being that is more involved, engaged, and shadow-throwing than mere picture-taking.
The optical sleight of hand used by the astronomers combined the telescope's "adaptive optics" with a technique called aperture mask interferometry: using a a deformable mirror to rapidly correct for atmospheric distortions to starlight.
All round this aperture, which is the mouth, imagine that there are placed a number of feelers forming a circle.