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