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

 

elongation

 noun
noun
BrE BrE//ˌiːlɒŋˈɡeɪʃn//
 
; NAmE NAmE//ˌiːlɔːŋˈɡeɪʃn//
 
, NAmE//ˌiːlɑːŋˈɡeɪʃn//
 
[uncountable]
 
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the process of becoming longer or making something longer the elongation of vowel sounds