"prolongation" in the noun sense
1. prolongation, protraction, perpetuation, lengthening
the act of prolonging something
"there was an indefinite prolongation of the peace talks"
2. extension, lengthiness, prolongation
amount or degree or range to which something extends
"the wire has an extension of 50 feet"
3. lengthiness, prolongation, continuation, protraction
the consequence of being lengthened in duration
Source: WordNet® (An amazing lexical database of English)
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