prolongation in WordNet English dictionary

1. the consequence of being lengthened in duration
   lengthiness  prolongation  continuation  protraction 
   
2. amount or degree or range to which something extends
   "the wire has an extension of 50 feet"
   extension  lengthiness  prolongation 
   
3. the act of prolonging something
   "there was an indefinite prolongation of the peace talks"
   prolongation  protraction  perpetuation  lengthening