Features
Dictionary can be accessed through applications that support Mac OS X Services the application itself utilizes a freshly GUI theme, a variatiin on Aqua which is present in System Preferences - the application is quit when its sole window is closed, unlike several more Macintosh applications.

A key combination control key-command key-D can be utilized within Cocoa applications which display text - it brings higher the microscopic contextual menu-like definition or even equivalent word of a word under the cursor.

Apple have also involved the Dashboard Widget for accessing the Lexicon application. Around applications which trend lines "Services", there exists an guide in the application menu (e.g Safari>Services>Look higher within Lexicon) which will bring higher the Lexicon application & displays a definition of a selected word.