Aperture

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Aperture

1. An opening; particularly, that opening in the front of a camera through which light rays pass when a picture is taken.
2. The diameter of the objective of a telescope or other optical instrument, usually expressed in inches, but sometimes as the angle between lines from the principal focus to opposite ends of diameter of the objective.
3. Of a unidirectional antenna, that portion of a plane surface near the antenna, perpendicular to the direction of maximum radiation, through which the major part of the radiation passes. See effective area.

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use