acronym

noun

ac·​ro·​nym ˈa-krə-ˌnim 

: a word (such as NATO, radar, or laser) formed from the initial letter or letters of each of the successive parts or major parts of a compound term

also : an abbreviation (such as FBI) formed from initial letters : initialism

acronymic

ˌa-krə-ˈni-mik 

adjective

acronymically

ˌa-krə-ˈni-mi-k(ə-)lē 

adverb

Frequently Asked Questions

What is the difference between an acronym and an initialism?

Both acronyms and initialisms are made up of the first letter or letters of the words in a phrase. The word acronym typically applies when the resulting thing can be read as a word; for example, radar comes from "radio detection and ranging" and scuba comes from "self-contained underwater breathing apparatus." The word initialism only applies when the resulting thing is read as an abbreviation; for example DIY, which comes from "do it yourself," is pronounced by saying the names of the letters. Note that the word acronym is also sometimes used to mean "initialism."

What is the difference between an acronym and an abbreviation?

An acronym is a kind of abbreviation. Abbreviations can be shortened forms of any kind. For example, appt is an abbreviation of appointment, and ASAP is an abbreviation of as soon as possible. ASAP, however, also qualifies as an acronym because it is made up of the initial letters of the phrase it comes from: as soon as possible.

Is OK an acronym?

OK is technically an acronym. It comes from the phrase "oll korrect," a humorous alteration of "all correct."

Examples of acronym in a Sentence

The North Atlantic Treaty Organization is known by the acronym “NATO.”

Recent Examples on the Web

State wildlife officials recommend remembering this using the acronym AWARE: Act calm and do not run. —Jared Goffinet, The Enquirer, 7 July 2025

Xi’s absence from the two-day summit in Rio de Janeiro comes at a critical moment for BRICS, which owes its acronym to early members Brazil, Russia, India, China and South Africa, and since 2024 has expanded to include Egypt, the United Arab Emirates, Ethiopia, Indonesia and Iran. —Simone McCarthy, CNN Money, 5 July 2025

Known by the acronym TdA, the gang has been implicated in crimes such as human smuggling, human trafficking of immigrant women and girls, extortion and drug trafficking. —Elizabeth Zavala, Austin American Statesman, 2 July 2025

There are a couple of new acronyms to sprinkle into your marketing meetings: GEO (Generative Engine Optimization) and AIO (Artificial Intelligence Optimization). —Jj Rosen, The Tennessean, 2 July 2025

Word History

Etymology

probably borrowed from German Akronym, Akronymon, from akr- acr- + -onym, -onymon -onym

First Known Use

1940, in the meaning defined above

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Kids Definition

acronym

noun

ac·​ro·​nym ˈak-rə-ˌnim 

: a word (as radar) formed from the beginning letter or letters of each or most of the parts of a compound term