Substantiv
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| envelope -
A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
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| envelope -
Something that envelops; a wrapping.
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| envelope -
A bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.
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| envelope -
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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| envelope -
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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| envelope -
The shape of a sound, which may be controlled by a synthesizer or sampler.
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| envelope -
The information used for routing an email that is transmitted with the email but not part of its contents.
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| envelope -
An enclosing structure or cover, such as a membrane.
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| envelope -
The set of limitations within which a technological system can perform safely and effectively.
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| envelope -
The nebulous covering of the head or nucleus of a comet; a coma.
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| envelope -
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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