Envelope (disambiguation)

An envelope is the paper container used to hold a letter being sent by post.

Envelope may also refer to:

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)

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
 * , the fabric skin covering the airship
 * Building envelope, the exterior layer of a building that protects it from the elements
 * Envelope (motion), a solid representing all positions that an object may occupy during its normal range of motion
 * Envelope (music), the variation of a sound over time, as is used in sound synthesis
 * Envelope (radar), the volume of space where a radar system is required to reliably detect an object
 * Envelope (waves), a curve outlining the peak values of an oscillating waveform or signal
 * Envelope detector, an electronic circuit used to measure the envelope of a waveform
 * Flight envelope, the limits within which an aircraft can operate

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 (military), attacking one or both of the enemy's flanks to encircle the enemy
 * The envelope of an internet email, its SMTP routing information
 * Envelope system, a method of personal budgeting where money is allocated for specific purposes
 * Gaza envelope, a region in southwestern Israel adjacent to the Gaza Strip