Are you looking for English Dictionary?

- English Language:

For the English Language lovers and those who want to learn English this English Dictionary has over 200,000 word definitions and list of their synonyms.
The synonyms dictionary of English words lists more than 30,000 words with their synonyms. It is a browsable database of synonyms and related words.
The Word Definitions Dictionary has over 160,000 word definitions in English.

- Financial Dictionaries:

A very extensive list of Financial Terms and definitions can be found at this Financial Dictionary. The dictionary serves as financial education tool and has definitions of over 300 financial terms. The cool thing about this financial dictionary is that the definitions are explained with short articles, not just synonyms. Terms like bridge loan, balloon loan, predatory lending, payday loans, overdraft and certificate of deposit are to be found and thoroughly explained here.
Mortgage Dictionary is based on the same scheme and explains important real estate and mortgage definitions like Adjustable-Rate Mortgage, Canada Home Buyers Plan, Convertible mortgage, Debt Consolidation, Home Equity Line Of Credit and many more.
Another Finance related dictionary is the Financial Terms Canada which has definitions for over 1000 Canadian and generic financial terms. Some of the most popular articles are Receiver General for Canada, Canada Pension Plan, Crown Corporation, Goods and Service Tax, Secured Credit Cards.
The Investment Dictionary can educate future investors and help them learn basic investment terms like what is Listed Stock, Dow Jones, Preferred Stock, Margin Call, Stock Split and more.
Some people need help when it comes to banking terms like compound interest, debt instrument or compensating balance so this Banking Terms Dictionary was created to explain the terms used frequently by the banking specialists.
Last but not least the Debt Dictionary which is a glossary of debt, loan and credit terms and phrases listing the most commonly and frequently used.

- Technology Dictionaries:

This Technology Dictionary has over 14,000 technology and computer related terms. Here you can find terms form IT, programming languages, mathematics, electronics, operating systems, software, hardware, networking and telecommunications. Very useful for the techies :)
One more favourite dictionary on my list is the Database Dictionary listing common database and SQL terms and phrases. If you have difficulty understanding what is MySQL, FoxPro, Stored Procedure, ROLLBACK, Data Warehouse or Data Mining you can take a look and bookmark this dictionary.
For all the people out there who have web sites and struggle with their web hosting setup and the terms the web hosts are using here the Hosting Dictionary is here to help listing more than 170 hosting related terms like Windows Hosting, Linux Hosting, DNS, SMTP, Hosting Control Panel, Database Hosting, Shared Hosting, Mail Server, Dedicated Hosting, VPS, Domain Registration, etc.

- Law Dictionaries:

My favourite dictionary explaining law and legal terms is the Legal Dictionary. It has more than 6000 law related terms. Ever wonder what is Salvage, Tangible Property? Here you can find detailed explanation. Next time you talk to a lawyer you won't be that lost in the conversation.
This Law Dictionary lists 1,000 legal definitions of law terms and their synonyms. For example if don't know what a Miranda rule is you can easily find out.
Insurance Dictionary doesn't quite fit in this category but I decided that is somehow related to law and besides the insurance agents love using words that we don't understand so I think terms like escrow, HMO and viatical settlement won't sound like a foreign language to you anymore.

- Medical Dictionaries:

For someone who wants to be more prolific in Medical and Chemistry terms I have one medical dictionary and one periodic table guide. The Medical Dictionary lists 22,000 medical and health related terms. Wow! If you have a health condition, or you don't know what healthcare equipment is for or pharmaceutical drugs and medical devices are unknown to you here you can find descriptions.
And finally if you are curious to know more about the chemical elements, their symbol, atomic number, and weight, the Periodic table database lists all 110. Elements database also features Periodic Table Quiz and Chemistry Hangman Game to test your knowledge.