* American-Heritage Collegiate DictionaryOne of the best
* Century Unabridged Dictionary (1889)Old but still useful, especially for historical interests
* Cambridge Dictionaries OnlineFree Online English Dictionaries from Cambridge University Press.
* Historical Dictionary of American Slang alphaDictionary's own slang dictionary that allows you to search for the years of slang terms and slang variations of the same meanings.
These items are in the Mesa County Libraries collection. If the call number begins with Ref or Reference, this material is for use in the library only. Photocopiers are available. All other materials are available for checkout.