transiency

from WordNet (r) 3.0 (2006)

transiency
    n 1: an impermanence that suggests the inevitability of ending
         or dying [syn: {transience}, {transiency},
         {transitoriness}]

from The Collaborative International Dictionary of English v.0.48

Transience \Tran"sience\, Transiency \Tran"sien*cy\, n.
   The quality of being transient; transientness.
   [1913 Webster]

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