Definitions from Wiktionary ( )

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

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