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Noun prolongation has 3 senses
prolongation, protraction, perpetuation, lengthening - the act of prolonging something; "there was an indefinite prolongation of the peace talks"--1 is a kind of continuance, continuation
 
extension, lengthiness, prolongation - amount or degree or range to which something extends; "the wire has an extension of 50 feet"--2 is a kind of longness
 
lengthiness, prolongation, continuation, protraction - the consequence of being lengthened in duration--3 is a kind of duration, length
 
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