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 often 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

Strategies become filled with acronyms, presentations become overloaded with detail, explanations assume knowledge that many people simply do not have. — Julien Fortuit, Forbes.com, 6 Nov. 2026

These sections are narrated by the institutional voice of the CIA itself in a relentlessly sardonic tone rife with acronyms, codenames and jargon rendered in multiple fonts. — Literary Hub, 5 Nov. 2026

The festival’s English-language name includes those Black Nights, and so does its Estonian acronym PÖFF, which stands for Pimedate Ööde filmifestival, which translates as Black Nights Film Festival. — Georg Szalai, HollywoodReporter, 5 Nov. 2026

Using an acronym meant for minor zoning squabbles against resistance to a massive, 80 mph express train slicing through dense residential blocks is an arrogant posture that completely obscures the true nature of this unconscionable project. — Chicago Tribune, 2 Nov. 2026

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