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English - English (Wordnet) dictionary (also found in English - Vietnamese, )
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  • the bag containing the gas in a balloon
  • the maximum operating capability of a system (especially an aircraft)
    • test pilots try to push the envelope
  • a natural covering (as by a fluid)
    • the spacecraft detected an envelope of gas around the comet
  • a curve that is tangent to each of a family of curves
  • any wrapper or covering
  • a flat (usually rectangular) container for a letter, thin package, etc.
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