Envelope (disambiguation)

An envelope is a thin paper container formed by folding a sheet of paper and securing the edges, and is the major staple consumable of a letterpost service.
The envelope of an e-mail contains the information used for routing and is passed along the e-mail without being part of the actual message.
In mechanical engineering, an envelope is a solid representing all positions which may be occupied by an object during it's normal range of motion.
An envelope is a mathematical curve, surface, or higher dimensional object defined as being tangent to a given family of lines or curves (or surfaces, or higher dimensional objects, resp.).
An envelope is a curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics. See envelope detector.
An envelope is the shape of a sound which may be controlled by a synthesizer or sampler in music, derived from the above definition for electronics.
An envelope is the outer layer of some viruses.

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In aerospace, an envelope is the limits within which an aircraft can operate.
The envelope of a blimp or airship is the airtight covering that holds buoyant gas.
The envelope paradox is a paradox in probability.
Envelope (band) is a Danish alternative rock band.

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