From Wikipedia, the free encyclopedia
|Look up envelope in Wiktionary, the free dictionary.|
An envelope is the paper container used to hold a letter being sent by post.
Envelope may also refer to:
- 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)
- Viral envelope, the membranal covering surrounding the capsid of a virus
- Cell envelope of a bacterium, consisting of the cell membrane, cell wall and outer membrane
In applied science:
- Envelope (waves), a curve joining the peaks of an oscillating waveform or signal
- Envelope detector, an electronic circuit used to measure the envelope of a waveform
- ADSR envelope, the variation of a sound over time, as is used in sound synthesis
- Envelope (motion), a solid representing all positions that an object may occupy during its normal range of motion
- Flight envelope, the limits within which an aircraft can operate
- Building envelope, the exterior layer of a building that protects it from the elements
- Envelope (airships), the fabric skin covering the airship
- Envelopes (band), an indie/pop band from Sweden and France, based in the UK
- Envelope (film), a 2012 film
- Envelope (poetry), a poetic device in which a line or a stanza is repeated to enclose a section of verse
- Envelope (military) (also envelop) attacking one or both of the enemy's flanks to encircle the enemy
- Two envelopes problem, a paradox
- Common envelope event, a short-lived phase in the evolution of a binary star in which the larger of the two stars has initiated unstable mass transfer to its companion star
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