Multidef is a utility application and service for looking up the definitions of multiple words at one time and displaying the cumulative results in a single, editable window which can be copied to the clipboard or saved to a file. You are supposed to install the application into your Applications folder and launch it to activate the service it provides.
The service works on any text selection in any application that provides text on the clipboard.
One World Dictionary by Ascendo is a leading multilingual reference tool for Apple desktops.
InstantTranslate makes it really easy to translate a selection of text in the application you are working in from one language to another language.
