Definition of prolongation noun from the Oxford Advanced Learner's Dictionary

 

prolongation

 noun
noun
BrE BrE//ˌprəʊlɒŋˈɡeɪʃn//
 
; NAmE NAmE//ˌproʊlɔːŋˈɡeɪʃn//
 
[uncountable, singular](formal)
 
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the act of making something last longer the artificial prolongation of human life
See the Oxford Advanced American Dictionary entry: prolongation