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initialism

[ih-nish-uh-liz-uh m] /ɪˈnɪʃ əˌlɪz əm/
noun
1.
a set of initials representing a name, organization, or the like, with each letter pronounced separately, as FBI for Federal Bureau of Investigation.
2.
a name or term formed from the initial letters of a group of words and pronounced as a separate word, as NATO for North Atlantic Treaty Organization; an acronym.
3.
the practice of using initials or forming words from initials.
Origin
1895-1900
1895-1900; initial + -ism
Can be confused
abbreviation, acronym, initialism.
Grammar note
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for initialism
  • Listings are alphabetical with the acronym or initialism followed by its full word equivalent.
  • An initialism is similar to acronym but is not pronounced as a word.
Word Origin and History for initialism
n.

word formed from the first letters of other words or a phrase, 1957, from initial (n.) + -ism. The distinction from acronym is not universally agreed-upon; in general, words such as NATO, where the letters form a word, are regarded as acronyms, those such as FBI, where the letters sound as letters, are initialisms.

Online Etymology Dictionary, © 2010 Douglas Harper
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