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English Definitions
envelope
N
a flat (usually rectangular) container for a letter, thin package, etc.
envelope
N
any wrapper or covering
envelope
N
a curve that is tangent to each of a family of curves
envelope
N
a natural covering (as by a fluid)
envelope
N
the maximum operating capability of a system (especially an aircraft)
envelope
N
the bag containing the gas in a balloon
English Definitions from WordNet 3.0
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