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Dictionary.net searches the following recognised dictionaries:

• Webster's Revised Unabridged Dictionary (G & C Merriam Co., 1913, edited by Noah Porter), is provided by Patrick Cassidy of MICRA Inc., Plainfield, NJ, USA.
• The Jargon File - The Jargon file is a publis domain lexicon of hacker jargon, edited by Eric Raymond.
• Devils Dictionary 1911
• The Free On-line Dictionary of Computing - FOLDOC is a searchable dictionary of acronyms, jargon, programming languages, tools, operating systems, in fact anything to do with computing.
• CIA World Factbook
• The Elements Database - A freely distributed database of elemental information, edited by Jay Kaminek.