Definition of dissappear

(Edward Austin Walton, "On Education for the Interior...)

The necessity of that day has long disappeared .

(Frank Oppenheimer, "Science and Fear-- A Discussion...)

This and other fears of the solar_system have disappeared gradually , first , with the Ptolemaic_system and its built-in concept of periodicity and_then , more firmly , with the Newtonian innovation of an universal force that could account quantitatively for both terrestrial and celestial motions .

Much of the former extreme uneasiness associated with visions and hallucinations and with death has disappeared .

(James A. Ibers et al., "Proton magnetic resonance...)

One sample , which had been exposed to the atmosphere after evacuation at 375 ` C , showed the presence of adsorbed water ( about 0.3 wt % ) as evidenced by a weak resonance line which was very narrow at room_temperature and which disappeared , due_to broadening , at low_temperature .

(J. F. Vedder, "Micrometeorites", in Francis S. J...)

Since there is a continual loss of micrometeoritic material in space because of the radiation effects , there must be a continual replenishment : otherwise , micrometeorites would have disappeared from interplanetary_space .