envelope.
A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
Meaning & usage
A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.
Something that envelops; a wrapping.
A bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.
A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.
A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.
The shape of a sound, which may be controlled by a synthesizer or sampler.
The information used for routing a message that is transmitted with the message but not part of its contents.
An enclosing structure or cover, such as a membrane; a space between two membranes
The set of limitations within which a technological system can perform safely and effectively.
push the envelope
The nebulous covering of the head or nucleus of a comet; a coma.
An earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it.
Where this word comes from
PIE word *h₁én From French enveloppe. The engineering sense is derived from flight envelope. The verb is from the noun.
To put (something) in an envelope.
Where this word comes from
PIE word *h₁én From French enveloppe. The engineering sense is derived from flight envelope. The verb is from the noun.
Archaic form of envelop.
Where this word comes from
See envelop.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.