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

 

initialism

 noun
noun
BrE BrE//ɪnˈɪʃəlɪzəm//
 
; NAmE NAmE//ɪnˈɪʃəlɪzəm//
 
 
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a word formed from the first letters of the words that make up the name of something, with each letter pronounced separately, for example ‘CD’ is an initialism for ‘compact disc’ compare acronym