LiveDictionary is a Safari extension that adds fast, convenient dictionary lookups to the web. Once installed, it becomes a transparent part of Safari. LiveDictionary offers a wide array of dictionaries for technical terms, general language, and bilingual usage.
LiveDictionary comes with the WordNet 2.0 English Dictionary. Point to any word on your screen and see its definition. Discover new words, or reinforce your knowledge. Other dictionaries are also available, with different content and domain-specific knowledge. The Free On-line Dictionary of Computing provides definitions for even the most obscure computing terms.
LiveDictionary is perfect for learning another language. Translation dictionaries, such as the EDICT Japanese-English Dictionary or the dictionaries available from FreeDict.de allow you to read foreign-language web pages with incredible ease. If you're learning English, LiveDictionary is a great learning aid. Point to an English word on a web page, and see its translation in your native language.
The Dictionary Downloader allows you to effortlessly download and install dozens of dictionaries. Point and click, and the new dictionary is available instantly.