Meaning of envelope

en•ve•lope

Pronunciation: (en'vu-lōp", än'-), [key]
— n.
  1. a flat paper container, as for a letter or thin package, usually having a gummed flap or other means of closure.
  2. something that envelops; a wrapper, integument, or surrounding cover.
  3. a surrounding or enclosing structure, as a corolla or an outer membrane.
  4. a curve or surface tangent to each member of a set of curves or surfaces.
  5. (of a modulated carrier wave) a curve connecting the peaks of a graph of the instantaneous value of the electric or magnetic component of the carrier wave as a function of time.
  6. the fabric structure enclosing the gasbag of an aerostat.
  7. the gasbag itself.
  8. the airtight glass or metal housing of a vacuum tube.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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