disappearance
dɪsəˈpɪərəns
noun
an act of someone or something ceasing to be visible.
the sun’s disappearance at night
vanishing,fading,fading/melting away,passing from sight,receding from view,withdrawal,departure,retirement,retreat,going,passing,exit,ebb,wane,dissipation,dematerialization,dissolution,evaporation,evanescence