aperture (disambiguation) aperture (disambiguation) the aperture of an optical system is the opening that limits the amount of light that can pass through. look up aperture in wiktionary, the free dictionary. aperture may also refer to: science and technology in anatomy, a number of apertures in the human body: apertura nasalis posterior apertura pelvis inferior apertura pelvis minoris apertura pelvis superior apertura thoracis inferior apertura thoracis superior lateral aperture (foramen of luschka), an opening in each lateral extremity of the lateral recess of the fourth ventricle of the human brain median aperture (foramen of magendie), which drains cerebrospinal fluid (csf) from the fourth ventricle into the cisterna magna antenna aperture, a physical parameter of an antenna aperture (mollusc), the main opening in the shell of a gastropod or scaphopod (mollusc) aperture (botany), a weaker spot in the wall of a pollen grain numerical aperture is a parameter used to describe optical systems aperture (computer memory), a region of the physical address space that opens access to a particular device or memory unit aperture (software), an image organization and editing program for photographers, sold by apple inc. other uses aperture (magazine), a long-running art photography magazine "aperture" (song), a song by emily blue aperture (typography), an enclosed loop in a typographical symbol, such as the lower part of the letter 'a' aperture foundation, a photography nonprofit aperture science, a fictional organization featured in the portal video game series