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envelope

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Noun envelope has 6 senses
  1. envelope - a flat rectangular paper container for papers
    --1 is a kind of     container
    --1 has particulars: window envelope
  2. envelope - any wrapper or covering
    --2 is a kind of     wrapping, wrap, wrapper
  3. envelope - a curve that is tangent to each of a family of curves
    --3 is a kind of     curve, curved shape
  4. envelope - a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
    --4 is a kind of     covering, natural covering, cover
  5. envelope - the maximum operating capability of a system; "test pilots try to push the envelope"
    --5 is a kind of     operating capability, performance capability
  6. envelope, gasbag - the bag containing the gas in a balloon
    --6 is a kind of bag
    --6 is a part of balloon
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