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- Acronym Finder
Defines over 750,000 acronyms, abbreviations and initialisms from a variety of subjects.
- Free Dictionary
The main source of this dictionary is fourth edition of the American Heritage Dictionary of the English Language. There are links to medical, legal and financial dictionaries.
- Merriam-Webster Dictionary
Based on the 11th edition of the Merriam Webster's Collegiate Dictionary, published in 2003. Each entry includes a pronunciation, definition, usage and etymology. A thesaurus is also included.
- Roget's Thesaurus
The online edition of the 1995 edition, which contains 35,000 synonyms and 250,000 cross-references.