American Heritage Dictionary of the English Language, Third Edition
Contains over 350,000 entries and meanings, enhanced by examples of use and etymology.

Cambridge Dictionaries Online
The user can search a word in the Cambridge International Dictionary of English, Cambridge Dictionary of American English, Cambridge International Dictionary of Idioms, or Cambridge International Dictionary of Phrasal Verbs

HandSpeak; A Practical Sign Language Online Dictionary
A searchable dictionary of ASL and ISL with animated demonstrations, from Deaf World Web.

Merriam-Webster Online
Includes both the Merriam-Webster Collegiate Dictionary and the Collegiate Thesaurus. If you aren’t sure of spelling, this dictionary will give you words close to your search request.

Roget's Internet Thesaurus
The Web version of Roget's Thesaurus of English Words and Phrases - a good aid to finding synonyms for overused words, or you can browse classes of words.

Travlang’s Translating Dictionaries and Foreign Languages for Travelers at http://dictionaries.travlang.com/ and http://www.travlang.com/languages/
Online translating dictionaries geared toward the international traveler.

Wordsmyth; the Educational Dictionary-Thesaurus
Combines the functions of a dictionary and a thesaurus with search capabilities; reflects the philosophy that word meanings grow out of specific uses and contexts.

Acronyms and Abbreviations

The WWW Acronym and Abbreviation Server
An award-winning searchable list of acronyms and abbreviations.

Acronym Finder
A searchable database of acronyms, abbreviations, and initialisms and their meanings, with an emphasis on computers, communications, and technology.

Mega-Sites

Language Dictionaries and Translators
Gateway to dictionary and translation services for over 100 languages.

OneLook Dictionaries: The Fast Finder
Indexes over 600 dictionaries including many in specialized subject areas. Search engine allows you to search special subject, general, or all dictionaries at once.

yourDictionary.com
A comprehensive portal for language, and language-related products and services on the world wide web, covering more than 1500 dictionaries representing more than 230 languages. Includes dictionaries, thesauri, and grammars.

Yahoo's list of dictionaries

Please note that the following materials are restricted to current UF Faculty, Students, and Staff:

Oxford English Dictionary (UF faculty, students, and staff only)
The Oxford English Dictionary is the accepted authority on the evolution of the English language over the last millennium. It is an unsurpassed guide to the meaning, history, and pronunciation of over half a million words, both present and past.