Envelope (disambiguation)

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)

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
Envelope (airships), the fabric skin covering the airship

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 is its SMTP routing information. The addresses in the envelope are often present in the header portion of the contents, but not for, e.g., Blind carbon copy.

See also