Envelope definition

ĕnvə-lōp, ŏn-
Frequency:
(biology) An enclosing structure or cover, such as a membrane or the outer coat of a virus.
noun
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The definition of an envelope is a container made of folded paper or cardboard.

An example of an envelope is what you would seal a letter in before mailing it to someone.

noun
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A thing that envelops; wrapper; covering.
noun
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The set of limitations within which a technological system, especially an aircraft, can perform safely and effectively.
noun
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2
(astron.) A cloudy mass surrounding the nucleus of a comet; coma.
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(biol.) Any enclosing membrane, skin, shell, etc.
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(math.) A curve that is tangent to every one of a family of curves, or a surface that is tangent to every one of a family of surfaces.
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The outer covering of a rigid airship.
noun
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The bag that contains the gas in a balloon or nonrigid airship.
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A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
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Something that envelops; a wrapping.
noun
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A bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.
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(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.
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(electronics) A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.
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(music) The shape of a sound, which may be controlled by a synthesizer or sampler.
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(computing) The information used for routing an email that is transmitted with the email but not part of its contents.
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(biology) An enclosing structure or cover, such as a membrane.
noun
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(engineering) The set of limitations within which a technological system can perform safely and effectively.
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(astronomy) The nebulous covering of the head or nucleus of a comet; a coma.
noun
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An earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it.

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(nonstandard) Alternative spelling of envelop.
verb
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A flat paper container, especially for a letter, usually having a gummed flap.
noun
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Something that envelops; a wrapping.
noun
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(biology) An enclosing structure or cover, such as a membrane or the outer coat of a virus.
noun
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1
The bag containing the gas in a balloon or airship.
noun
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1
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(mathematics) A curve or surface that is tangent to every one of a family of curves or surfaces.
noun
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A usually spherical region of interstellar matter surrounding a forming star and interacting with the star's gravitational and radiation fields.
noun
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1
The coma of a comet.
noun
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A folded paper container as for a letter, usually with a gummed flap for sealing.
noun
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1
The set of limitations, as for a particular aircraft, system, etc., within the boundaries of which it can operate safely and efficiently.
noun
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A set of limits or boundaries.
noun
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push the envelope
  • To exceed or try to exceed the existing limits of a discipline or activity.
idiom
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Other Word Forms

Noun

Singular:
envelope
Plural:
envelopes

Idioms and Phrasal Verbs

Origin of envelope

  • French enveloppe from envelopper to envelop from Old French envoloper envelop

    From American Heritage Dictionary of the English Language, 5th Edition

  • From the French enveloppe, from envelopper.

    From Wiktionary

  • See envelop.

    From Wiktionary