Envelope (disambiguation)
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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:
In mathematics
- 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)
- Envelope (category theory)
In science
- 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
- Airship#Envelope, the fabric skin covering the airship
- Envelope (radar), the volume of space where a radar system is required to reliably detect an object
In entertainment
- Envelopes (band), an indie/pop band from Sweden and France, based in the UK
- Envelope (film), a 2012 film
- "Envelopes", a song by Frank Zappa from his 1982 album Ship Arriving Too Late to Save a Drowning Witch
Other uses
- 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
- The envelope of an Internet email, its SMTP routing information
See also
- 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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