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Definitions for: Envelope
[n] any wrapper or covering
[n] a flat rectangular paper container for papers
[n] the bag containing the gas in a balloon
[n] the maximum operating capability of a system; "test pilots try to push the envelope"
[n] a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
[n] a curve that is tangent to each of a family of curves
Webster (1913) Definition: En"vel*ope (?; 277), Envelop En*vel"op (?; 277), n.
[F. enveloppe.]
1. That which envelops, wraps up, encases, or surrounds; a
wrapper; an inclosing cover; esp., the cover or wrapper of
a document, as of a letter.
2. (Astron.) The nebulous covering of the head or nucleus of
a comet; -- called also coma.
3. (Fort.) A work of earth, in the form of a single parapet
or of a small rampart. It is sometimes raised in the ditch
and sometimes beyond it. --Wilhelm.
4. (Geom.) A curve or surface which is tangent to each member
of a system of curves or surfaces, the form and position
of the members of the system being allowed to vary
according to some continuous law. Thus, any curve is the
envelope of its tangents.
Synonyms: gasbag
See Also: bag, balloon, container, cover, covering, curve, curved shape, natural covering, operating capability, performance capability, window envelope, wrap, wrapper, wrapping
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