English dictionary

envelope meaning and definition


Definition of envelope (noun)

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