envelope

/ˈɛnvʌloʊp/

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Definitions

Noun
a flat (usually rectangular) container for a letter, thin package, etc.
Noun
any wrapper or covering
Noun
a curve that is tangent to each of a family of curves
Noun
a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
Noun
the maximum operating capability of a system (especially an aircraft); "test pilots try to push the envelope"
Noun
the bag containing the gas in a balloon

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