Meaning : The act of prolonging something.
Example :
There was an indefinite prolongation of the peace talks.
Synonyms : lengthening, perpetuation, protraction
Meaning : Amount or degree or range to which something extends.
Example :
The wire has an extension of 50 feet.
Synonyms : extension, lengthiness
Meaning : The consequence of being lengthened in duration.
Synonyms : continuation, lengthiness, protraction