#disappearance  the event of passing out of sight
  exclusion:  #appearance.happening
  supertype:  #happening__occurrence__natural_event__naturalevent  an event that happens
  subtype:  #evanescence  the event of fading and gradually vanishing from sight; "the evanescence of the morning mist"
  subtype:  #vanishing.disappearance  a sudden or mysterious disappearance
  subtype:  #receding__fadeout  a slow or gradual disappearance

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