Definition of "envelope" in Anglais

noun

1. A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.

2. Something that envelops; a wrapping.

3. A bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.

4. (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.

5. (electronics) A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.

6. (music) The shape of a sound, which may be controlled by a synthesizer or sampler.

7. (networking) The information used for routing a message that is transmitted with the message but not part of its contents.

8. (biology) An enclosing structure or cover, such as a membrane; a space between two membranes

9. (engineering) The set of limitations within which a technological system can perform safely and effectively.

   • push the envelope

10. (astronomy) The nebulous covering of the head or nucleus of a comet; a coma.

11. An earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it.

verb

1. (transitive, rare) To put (something) in an envelope.

verb

1. Archaic form of envelop.