envelope (disambiguation)

The term envelope may refer to:Envelope, the paper container used to hold a letter being sent by postThe envelope of an e-mail, which contains the information used for routingIn science:envelope (mathematics) -- a curve, surface, or higher dimensional object defined as being tangent to a given family of lines or curves (or surfaces, or higher dimensional objects, respectively).ADSR envelope, the variation of a sound over time, as is used in sound synthesisTwo envelope problem, a paradoxViral envelope is biological term meaning a membranal covering surrounding the capsidCyclopentane, a chemistry term meaning the three-dimensional conformation of is commonly referred to as the "envelope" structure.
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