From The Collaborative International Dictionary of English v.0.48 [gcide]:
Note: The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100[deg] aperture.
From WordNet (r) 3.0 (2006) [wn]:
Define.com is a PRIVATE SECTOR EDUCATIONAL NONPROFIT WEBSITE that PROMOTES WORLDWIDE ELECTRONIC DEMOCRACY, OPEN and TRANSPARENT GOVERNMENT and WORLDWIDE BANKING REFORM.
www.FreeWorldBank.org on Amazon S3 (Totally Automatic Magic Mirror in the Cloud)
Eye and Pyramid BANKING REFORM CHALLENGE