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An abbreviation formed from the initial letters of a phrase where each individual letter is articulated as its separate alphabetic name (such as FBI, CIA, ATM, and HTML), distinct from acronyms which are pronounced as single words.
Linguists strictly distinguish 'initialisms' (alphabetisms) from 'acronyms': initialisms are pronounced letter-by-letter (e.g. F-B-I, C-I-A, D-N-A, H-T-M-L, V-I-P), whereas acronyms are phonetically pronounced as normal lexical words (e.g. NATO, NASA, LASER, SCUBA). Initialisms proliferated exponentially during the 19th and 20th centuries alongside telegraphy, bureaucratic state administration, the rise of intelligence agencies, and computational telecommunications. While acronyms frequently undergo full lexicalization into lowercase nouns ('laser', 'scuba', 'radar'), initialisms retain their distinct alphabetical identities in spoken language.
Test any abbreviation to explore initialism properties:
Verified English words exemplifying initialisms (letter-sound abbreviations) with Scrabble scores
Linguistic definitions, etymological origins, and tournament usage
An initialism is pronounced as individual letters (F-B-I, C-I-A, U-R-L). An acronym is pronounced as a single unified word (NASA, NATO, LASER).