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Noun: initialism  in'i-shu,li-z(u)m
  1. A word formed from the initial letters of the several words in the name and pronounced as one word
    "'NATO' is an initialism for North Atlantic Treaty Organization";
    - acronym
     
  2. An abbreviation formed from the initial letters of the several words in the name and pronounced separately
    "HTML is an initialism for HyperText Markup Language"

Derived forms: initialisms

Type of: abbreviation, descriptor, form, signifier, word form

Encyclopedia: Initialism