1. A small narrow opening.

2. A fixed or adjustable opening in a piece of equipment such as a camera or microscope that lets light pass through a lens or mirror.

3. The diameter of an aperture in a piece of equipment such as a camera.
by Jafje April 10, 2007
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A lovely little scientific research and development company enlisted by the American MoD to produce shower curtains, among other intra-dimensional projects. Responsible for the production of the Genetic Lifeform and Disk Operating System (GLaDOS), the Aperture Science Handheld Portal Device (Portal gun, if you prefer), and many, many innovative iterations of the world-famous shower curtain, Aperture are secretive in their operations and productive in their exploits. Future projects include life-enhancing gel, spherical personality buddies and tractor beams (or excursion funnels).
Welcome to the Aperture Science Computer Assisted Enrichment Centre.

Aperture Science - a trusted friend in science.
by Jonnopon3000 July 11, 2010
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A gaping orifice of uncomprehensible dimensions.
"What's that noise? It sounds like someone hosing down the pavement."

"It's Misty having a piss."

"Holy shit! That's a big mother-fucking aperture."
by A & S October 29, 2006
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"who's that with the camera?"
"Thats our wedding photographer Simone"

"mmm, bet she's got a perfect aperture"
by alberto_sanchez October 6, 2011
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A company founded in 1953 by Cave Johnson, originally to create shower curtains for the U.S. Military, but went in a different direction after Johnson went insane from mercury poisoning. Most notable works include the Aperture Science Handheld Portal Device, and the supercomputer GLaDOS. Considered a rival to Black Mesa.
Aperture Science.

We do what we must, because we can.
by Dr. Paine July 19, 2009
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Please note that this may include spoilers for the games Portal and/or Portal 2.

Aperture Science is a scientific research company founded by Cave Johnson. It was once called "Aperture Fixtures" but then named "Aperture Science Innovators" to make the shower company more hygienic. The company was actually focused more on science. Long story short, In 1998, the robot, GLaDOS, was turned on during the holiday, "Bring your daughter to work day". Unfortunately, GLaDOS became self-aware and filled the Enrichment Centre with neurotoxin, killing the scientists. Aperture Science was closed and turned into testing area, run by GLaDOS.
Aperture Science. We do what we must because we can. For the good of all of us-- except the ones who are dead.
by Tactfulcore December 14, 2013
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The opening of the anus, from which Fundie Muck emerges.

see also; asshole.
William Randolph Hearst was an anal aperture because of his views on marajuana.

eg: William Randolph Hearst claimed marajuana and hashish was addictive and made men mad, as in insane.
by follywood April 21, 2009
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