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3.
A female photographer's vagina.
"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
 
1.
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.

See definition of aperture above.
by Jafje April 10, 2007
 
2.
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
 
4.
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