Open English Wordnet
Nouns
(n)prolongation, protraction, perpetuation, lengtheningthe act of prolonging something“there was an indefinite prolongation of the peace talks”
(n)extension, lengthiness, prolongationamount or degree or range to which something extends“the wire has an extension of 50 feet”
(n)lengthiness, prolongation, continuation, protractionthe consequence of being lengthened in duration