1. envelope | |
A flat (usually rectangular) container for a letter, thin package, etc.
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2. envelope | |
Any wrapper or covering
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3. envelope | |
A curve that is tangent to each of a family of curves
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4. envelope | |
A natural covering (as by a fluid)
"the spacecraft detected an envelope of gas around the comet";
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5. envelope | |
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] | |
The bag containing the gas in a balloon
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