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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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Jun 20 Word of the Day
Marginalized Orientations, Gender identities, And Intersex. it’s meant to be an all inclusive umbrella term for asexuals, homosexuals, multisexuals, trans people, and intersex people. Alternative to LGBTQIAP+
Alternative to MOGII, easier to pronounce.
The MOGAI community in my city is very friendly.
by sebasty September 04, 2014
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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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"who's that with the camera?"
"Thats our wedding photographer Simone"

"mmm, bet she's got a perfect aperture"
by alberto_sanchez October 06, 2011
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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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