Added 9 October 2026 initialism /ɪˈnɪʃəlɪzəm/ noun Categories: LanguageObscure Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about initialism at Wordnik → Where our words come from → A term formed from the initial letters of several words or parts of words, which is itself pronounced letter by letter. The term BBC is an initialism for the British Broadcasting Corporation. The process of forming words or terms using initial letters of other words. Related Words: abbreviationsacronymsinitialssymbolsacronymalphabetismacronymyl.c.initialistpseudo-acronym Back to today's word