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Envelope (mathematics)
WordNet
noun
(1) Any wrapper or covering
(2) A flat rectangular paper container for papers
(3) The bag containing the gas in a balloon
(4) The maximum operating capability of a system
"Test pilots try to push the envelope"
(5) A natural covering (as by a fluid)
"The spacecraft detected an envelope of gas around the comet"
(6) A curve that is tangent to each of a family of curves