Envelope (disambiguation)

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Envelope comes from the French word envelopper, meaning to wrap in. All uses of the word envelope are related to this root meaning, but may have a more specific meaning in different contexts:

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 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).
In music theory, the envelope of a sound is its variation in amplitude over time; in Sound synthesis, envelopes are characterised by the attack, decay, sustain, and release times of the sound.
In philosophy of probability, the two envelope problem is a paradox.
In biology, the viral envelope is a membranal covering surrounding the capsid.
In chemistry, the three-dimensional conformation of cyclopentane is commonly referred to as the "envelope" structure.

In applied science:

envelope (mechanical engineering) -- a solid representing all positions that an object may occupy during its normal range of motion.
building envelope -- the exterior layer of a building that protect it from the elements.
In electronics, an envelope is a curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave. See envelope detector.
envelope (aerospace) -- the limits within which an aircraft can operate.
envelope (lighter-than-air-craft) -- the airtight covering that holds buoyant gas, in a blimp, airship, gas balloon or hot air balloon.
an envelope of glass separates the inner workings of incandescent or fluorescent light bulbs from their environment.

In the military:

double envelopment or Pincer movement.

In entertainment:

Envelope (band) -- a pop/rock band from Denmark.
Envelopes (band) -- an indie/pop band from Sweden and France, based in the UK.

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