Dictionaries (Electronic Reference Sources)

Search by acronym or abbreviation, do a reverse lookup to retrieve an acronym or abbreviation, or search by a word in the definition. Acronyms and abbreviations can also be browsed by category.

A searchable database containing common acronyms, abbreviations, and initialisms about all subjects. Search results are divided into broad categories such as information technology; military and government; business and finance; science and medicine; organizations and schools; and slang, chat, & pop culture.

A searchable index of acronyms and words used in acronyms.

Search or browse for "acronyms, initialisms, alphabetisms and other abbreviations."

From the U.S. Department of Defense, the dictionary includes a separate section on acronyms.

Billed as "the definitive resource for information about file extensions and file types," each entry contains information about the file format, a description of the file, and how to open the file.

A searchable database of file extensions and the programs that use them.

A searchable dictionary of acronyms, jargon, programming languages, tools, architecture, operating systems, networking, theory, conventions, standards, mathematics, telecoms, electronics, institutions, companies, projects, products, history, and in fact anything to do with computing.

An "online source for abbreviations, acronyms, initialisms, and similar classes." Provides basic definitions along with categories, country/region relevance, and popularity.

A database of freely available journal information including descriptions, journal abbreviations, journal homepage links, subject categories, and ISSNs.

Lists abbreviations for government agencies, programs, and publications; also includes links to the home page (or best alternative) for each agency, program, and publication listed.

Defines in non-technical language the more commonly used environmental terms appearing in EPA publications, news releases, and other Agency documents. From the U.S. Environmental Protection Agency.