initialism
Americannoun
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a set of initials representing a name, organization, or the like, with each letter pronounced separately, as FBI for Federal Bureau of Investigation.
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the practice of using initials or forming words from initials.
Grammar
See abbreviation.
Usage
What does initialism mean? An initialism is a term formed by abbreviating a phrase by combining certain letters of words in the phrase (often the first initial of each) into a single term. Common examples of initialisms include FBI (an initialism of Federal Bureau of Investigation) and TMI (an initialism of too much information). What’s the difference between an acronym and an initialism?Initialism is sometimes used as a synonym for acronym, but most technically it refers to an abbreviation in which each initial is pronounced separately, as in FBI and TMI. Although acronym is sometimes used generally to refer to any term formed from this kind of abbreviation, it typically refers to ones that can be pronounced as a word, like NASA (an acronym for National Aeronautics and Space Administration) and FOMO (a slang acronym for fear of missing out). Still, most people don’t distinguish between acronyms and initialisms—they usually end up calling most abbreviations acronyms. Both terms are often associated with their use in certain fields that use a lot of technical terms, like science, tech, and the military. But they’re popular in all kinds of contexts since they’re an easy way to make long phrases much shorter. Example: MIA is an initialism that stands for “missing in action.”
Etymology
Origin of initialism
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Saylor has continually urged investors to “HODL,” or hold on for dear life, an initialism reminding Bitcoin fans to cling to their digital assets for the long term.
From Barron's • Nov. 24, 2025
Some are specific to TikTok: FYP is an initialism for "For You Page," the TikTok feed that delivers an endless stream of videos curated to your interests.
From Salon • Mar. 21, 2022
Athletes from Russia, a country officially banned from the Olympics, competed under the banner of R.O.C., the initialism for the Russian Olympic Committee.
From New York Times • Aug. 8, 2021
DSS is the initialism for the Department of Social Security, which was replaced in 2001 by the Department for Work and Pensions.
From BBC • Aug. 27, 2020
“His answer to CT was the Taliban dealing with it, which was magical thinking,” one former official involved in the negotiations said, using an initialism for counterterrorism programs.
From Washington Post • Mar. 8, 2020
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
