prolongation - definition and synonyms

noun very formal 

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/ˌprəʊlɒŋˈɡeɪʃ(ə)n/
singularprolongation
pluralprolongations
  1. 1
    [uncountable] the action of making something last longer
  2. 2
    [countable] an increase in the length of time that something lasts