noun. An opening, such as a hole, gap, or slit.

noun. undefined

noun. 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.

noun. The diameter of such an opening, often expressed as an f-number.

noun. The diameter of the objective of a telescope.

noun. The act of opening out or unfolding.

noun. An opening; a hole, orifice, gap, cleft, or chasm; a passage or perforation; any direct way for ingress or egress.

noun. In geometry, the space between two intersecting right lines.

noun. In optics, the diameter of the exposed part of the object-glass in a telescope or other optical instrument.

noun. The act of opening.

noun. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole.

noun. The diameter of the exposed part of the object glass of a telescope or other optical instrument.

noun. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.

noun. Something which restricts the diameter of the light path through one plane in an optical system.

noun. 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.

noun. 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.

noun. The maximum angle between the two generatrices.

noun. a device that controls amount of light admitted

noun. an man-made opening; usually small

noun. a natural opening in something

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abdominal apertures  absolute aperture  aperture-sight  branchial aperture  pedal aperture  

aperient  

regulator  

archway  cavern  cavity  chasm  crack  

access  aisle  alley  ambulatory  arcade