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Define this.. initial.rev142.1-signed.1-signed
Provides definitions of English words by simply highlighting, right clicking and selecting the 'Define this..' menu option
This add-on has been marked as experimental by its developers
This add-on is not compatible with your version of Firefox because of the following:
About this Add-on
To use just highlight the word or phrase that you need to define, right click your selection and choose the "Define this.." option from the context menu.