noun

• (electronics, television) The blurry appearance of a television picture resulting from interference caused by multipath reception.
• (computing) Ghost imaging.
• (computing) A problem with a keyboard where certain simultaneous keypresses trigger the action of a further key that was not in fact pressed.
  "Examine your matrix map, and make sure that no three keystrokes form a rectangle with a fourth keystroke that will cause you problems. This prevents both ghosting and blocking."
• (colloquial) A method of ending a personal relationship by stopping any contact with the other party and not providing an explanation.
  "Stories of ghosting often deal with broken-off romances, but it's worth mentioning that friend ghosting is real, and sometimes necessary."