Source : Webster's Revised Unabridged Dictionary (1913)

Disappear \Dis`ap*pear"\, v. i. [imp. & p. p. {Disappeared}; p.
   pr. & vb. n. {Disappearing}.]
   1. To cease to appear or to be perceived; to pass from view,
      gradually or suddenly; to vanish; to be no longer seen;
      as, darkness disappears at the approach of light; a ship
      disappears as she sails from port.

   2. To cease to be or exist; as, the epidemic has disappeared.

Source : WordNet®

disappear
     v 1: get lost, especially without warning or explanation; "He
          disappeared without a trace" [syn: {vanish}, {go away}]
          [ant: {appear}]
     2: become invisible or unnoticeable; "The effect vanished when
        day broke" [syn: {vanish}, {go away}]
     3: cease to exist; "An entire civilization vanished" [syn: {vanish}]
        [ant: {appear}]
     4: become less intense and fade away gradually; "her resistance
        melted under his charm" [syn: {melt}]