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Acronymfinder

Find out what any acronym, abbreviation, or initialism stands for

With more than 1,000,000 human-edited definitions, Acronym Finder is the world's largest and most comprehensive dictionary of acronyms, abbreviations, and initialisms. Combined with the Acronym Attic, Acronym Finder contains more than 5 million acronyms and abbreviations. You can also search for more than 850,000 US and Canadian postal codes.

Acronym Finder in The Wall STreet Journal An exponentially expanding dictionary consulted by bureaucrats, translators, doctors, weapons designers and anyone else who needs help decrypting the wide world's daily output of acronyms
Acronym Finder in the USA Today Get an astounding array of explanations for things like HRT and NASP. And if you're really bored, make up an acronym and see what it means
Acronym Finder in The Washington Post What a fabulous find!
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You can search or filter terms from the following categories:

Information Technology (IT)

Information technology, Internet/Web, telecommunications, computing & computer science, hardware, software, etc. (over 86,000 definitions)
Examples: AJAX, CMM, DHCP, FTP, HTTP, PDA, RSS, SDK, TCP, WWW

Military & Government

Local, national and international governments, military, defense, defense industry, weapons systems, etc. (over 154,000 definitions)
Examples:  DoD, ICBM, ICE, NHS, MoD, NOAA, NSA, OSHA, NZQA

Business & Finance

Business, finance, accounting, marketing, real estate, shipping, companies, stock markets, products, etc. (over 76,000 definitions)
Examples: BOE, CEO, EBIDTA, FOB, GAAP, IKEA, IPO, MLS, P&L, TVM

Science & Medicine

Popular science, hard science, medicine, nature, engineering, physics, space, astronomy, geology, chemistry, etc. (over 145,000 definitions)
Examples: ACL, DNA, HEPA, LASER, MRI, PTFE, SSRI, TIA, TENS, VOC

Organizations & Schools

Local, national, and international organizations, schools, colleges, universities, education, non-profits, NGOs, etc. (over 195,000 definitions)
Examples: ALA, ANWB, BBB, IEEE, MoMA, NEA, UCLA, UN, WTO

Slang & Pop Culture

Slang, chat, instant messaging, newsgroups, sports, people, pop culture, etc. (over 41,000 definitions)
Examples: AFAIK, BRB, IIRC, IMHO, JFK, LOL, MVP, RBI, ROFL