envelope

IPA: ˈɛnvʌɫoʊp

A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
Something that envelops; a wrapping.
A bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.
(geometry) A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.
(electronics) A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.
(music) The shape of a sound, which may be controlled by a synthesizer or sampler.
(computing) The information used for routing a message that is transmitted with the message but not part of its contents.
(biology) An enclosing structure or cover, such as a membrane; a space between two membranes
(engineering) The set of limitations within which a technological system can perform safely and effectively.
(astronomy) The nebulous covering of the head or nucleus of a comet; a coma.
An earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it.

Examples of "envelope" in Sentences

Make sure that the gap you used to turn the envelope is at the top left.
The outside of the envelope is stamped “Do Not Destroy, Official Document”.
Pushing the sexual envelope is just for the sport of seeing what one can get away with.
The contents of the envelope is NOT changed by the fact that its ownership is now split.
Note: The roots of the term envelope generator and its basic functionality are described in "Envelopes" on page 626.
The sender's name on the interplant envelope varies ( "Marketing", "Repairs", "Roman Polanski") and the previous line on the envelope is always in our Plano office.
Though Mr. Talbot has cut off all communication between the sisters, a cryptic letter from Lilian manages to slip through, and hidden in the envelope is a puzzling photograph of a tiger hunt.
Mind you - to the naked monkey eye this envelope is absolutely indistinguishable from the envelopes issued by Tor ... but who can fathom why a cat will obsessively hoard one object, and ignore an identical one?