envelope

/'enviloup/
Noun
  1. the bag containing the gas in a balloon
  2. the maximum operating capability of a system (especially an aircraft)
    • test pilots try to push the envelope
  3. a natural covering (as by a fluid)
    • the spacecraft detected an envelope of gas around the comet
  4. a curve that is tangent to each of a family of curves
  5. any wrapper or covering
  6. a flat (usually rectangular) container for a letter, thin package, etc.

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envelope
A woman places a letter into a white envelope.