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Definitions of envelope
  1. noun
    the bag containing the gas in a balloon

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    type of:
    bag
    part of:
  2. noun
    a curve that is tangent to each of a family of curves
    type of:
  3. noun
    a flat (usually rectangular) container for a letter, thin package, etc.
    type of:
  4. noun
    a natural covering (as by a fluid)
    "the spacecraft detected an envelope of gas around the comet"
  5. noun
    any wrapper or covering
    type of:
  6. noun
    the maximum operating capability of a system (especially an aircraft)
    "test pilots try to push the envelope"
Explanation of envelope
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