The event of fading and gradually vanishing from sight.

Roget 111: transience, transientness etc. adj.^†; evanescence, impermanence, fugacity [Chem], caducity^†, mortality, span; nine days' wonder, bubble, Mayfly; spurt; flash in the pan; temporary arrangement, interregnum.    velocity etc. 274; suddenness etc. 113; changeableness etc. 149.    transient, transient boarder, transient guest [U.S.].    ... show more

Roget 449: disappearance, evanescence, eclipse, occultation.    departure etc. 293; exit; vanishing point; dissolving views.