Acronyms, Symbols & Abbreviations

Thousands of abbreviations organized by subject category including technology, government, medicine, and international abbreviations.

Acronyms, Initialisms, and Abbreviations Dictionary

Features definitions of a wide variety of acronyms, initialisms, abbreviations, and similar contractions that allows users to quickly and easily translate terms into their full names or meanings. New terms from subject areas such as associations, education, the Internet, medicine, and others are now included.

Acronym Finder

Acronym Finder contains more than 4 million acronyms, abbreviations, and initialisms. It organizes results by category for easy searching. Categories include information technology, organizations, slang and popular culture, and more.

American Heritage Abbreviations Dictionary

Definitions of popular American abbreviations, including more recent technological abbreviations. Includes acronyms, blends, clippings, foreign words, initialisms, numericals, and truncations.

CASSI: CAS Source Index Search Tool

Provided by the American Chemical Society, CASSI is a "free tool to quickly identify or confirm journal titles and abbreviations for publications indexed by CAS since 1907, including serial and non-serial scientific and technical publications."


A guide to government acronyms and abbreviations. When possible, the acronyms are linked directly to the agency or program it represents.

Dorland’s Dictionary of Medical Acronyms & Abbreviations

Dorland’s Dictionary (formerly Jablonski’s) contains medical abbreviations and symbols across all medical specialties.

Journal Abbreviation Sources

Journal Abbreviation Sources, now a section in Acronym Finder, is a registry of web resources that list or provide access to the full title of journal abbreviations.
This online encyclopedia contains everything about symbols, signs, flags and glyphs arranged by categories such as culture, country, religion, and more.