• (RP) IPA: /ˈɛn.və.ləʊp/, /ˈɒn.və.ləʊp/
  • (GA) enPR än′vəlōp'; IPA: /ˈɛn.vəˌloʊp/, /ˈɑn.vəˌloʊp/

envelope (plural envelopes)

  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. (computing) 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.
  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.
  • (something that envelops): wrapper
  • (bag containing the lifting gas): gasbag
Translations Translations Translations Translations
  • French: enveloppe
  • German: Hüllkurve
  • Russian: огиба́ющая
  • Russian: огиба́ющая
  • Russian: огиба́ющая
  • Russian: оболо́чка
  • enPR: ĕn-vĕl'əp, IPA: /ɛnˈvɛləp/

envelope (envelopes, present participle enveloping; past and past participle enveloped)

  1. Archaic form of envelop#English|envelop.
    • 1877, James Booth, A Treatise on Some New Geometrical Methods (page 209)
      Again, if the plane of the impressed couple intersects the mean plane between N and C, it will envelope the cone whose focals are ON, ON′, and whose internal axis is therefore OA.

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