| 1. envelope | |
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A flat (usually rectangular) container for a letter, thin package, etc.
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| 2. envelope | |
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Any wrapper or covering
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| 3. envelope | |
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A curve that is tangent to each of a family of curves
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| 4. envelope | |
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A natural covering (as by a fluid)
"the spacecraft detected an envelope of gas around the comet";
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| 5. envelope | |
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The maximum operating capability of a system (especially an aircraft)
"test pilots try to push the envelope";
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| 6. envelope [ Synonyms: gasbag] | |
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The bag containing the gas in a balloon
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