#impermanence__impermanency  the property of not existing for indefinitely long durations
  exclusion:  #permanence
  supertype:  #duration.temporal_property__length  continuance in time; "the ceremony was of short duration"; "he complained about the length of time required"
  subtype:  #temporariness__temporarines  the property of lasting only a short time
  subtype:  #transiency__transience__transitoriness  an impermanence that suggests the inevitability of ending or dying
     subtype:  #fugaciousness__fugaciousnes  the lack of enduring qualities (used chiefly of plant parts)
     subtype:  #ephemerality__ephemeralness__ephemeralnes__fleetingnes  the property of lasting for a very short time
  subtype:  #mortality  the quality or state of being mortal

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