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  1. An envelope is a container used for sending mail (letters) through the postal system.
  2. An envelope is a mathematical curve tangent to a family of lines.
  3. An envelope is a curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.

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Black Hole of Calcutta

... They raved, fought, prayed, blasphemed, and many then fell exhausted on the floor, where snffocation put an end to their torments. About 11 o'clock the prisoners began ...