Computerworld Quickstudies
(http://www.computerworld.com/quickstudies)

Brief, concise overviews of key business and technology related concepts. Over 350 quickstudies are available.

Campbell R. Harvey's Hypertextual Finance Glossary (http://www.duke.edu/~charvey/Classes/wpg/glossary.htm)

Competing with Investor Words as the largest finance glossary is the Harvey's Finance Glossary.  Boasting 7,200 terms and over 18,000 cross-references, this is an excellent resource for finance and investment definitions and acronyms.  Browseable alphabetically only.

Dictionary of Small Business
(http://www.small-business-dictionary.org/)

A dictionary of over 2,500 of the most commonly used terms encountered by the start-up entrepreneur, the small business person and the student of business theory.

Global Investor Glossary (http://www.finance-glossary.com/pages/home.htm)

A glossary of 2,000 investing terms with extensive definitions and cross-references.

Investor Words (http://www.investorwords.com)

A massive glossary of 6,000 terms and 20,000 cross-references makes this one of the most extensive investment/financial glossaries on the Web.  Searchable and browsable.

Motley Fool Glossary (http://www.fool.com/school/Glossary/glossary.htm)

The Motley Fool's Glossary is not as extensive or as heavily cross-referenced as some other glossaries.  The definitions are written with a novice user in mind and are clear and jargon free.

Yahoo! Finance - Financial Glossary
(http://biz.yahoo.com/f/g/g.html)

Yahoo! provides access to an extensive collection of investing terms with clear and short definitions. This glossary is especially strong in acronyms.

Acronym Finder
(http://www.acronymfinder.com)