Definitions of envelope:
  • noun:   any wrapper or covering
  • noun:   a flat rectangular paper container for papers
  • noun:   the bag containing the gas in a balloon
  • noun:   the maximum operating capability of a system
    Example: "Test pilots try to push the envelope"
  • noun:   a natural covering (as by a fluid)
    Example: "The spacecraft detected an envelope of gas around the comet"
  • noun:   a curve that is tangent to each of a family of curves

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See envelope used in context: 50 rhymes, 1 Shakespeare work, several books and articles.

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