• noun a paper packet that contains a letter or document
  • noun the name for the data which contain a mail message with the destination address information
  • A glass housing which encloses the elements of electric lamps, electron tubes, and similar devices. An envelope may or may not be evacuated. Also called bulb (1).
  • A curve whose points pass through the peaks of a graph, such as that showing the waveform of an amplitude-modulated carrier.
  • That which serves to encompass or surround, such as the outer sheath of a cable.
  • The bounds within which an entity or system can be operated. For instance, the range of motion of a robotic end-effector.
  • In communications, a group of bits, or other information-carrying entity, treated as a unit.

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