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Instructions for remapping the "Define in OmniDictionary" Service shortcut key combination:
  • Bring up System Preferences and navigate to the Keyboard & Mouse preferences.
  • Choose the Keyboard Shortcuts view.
  • Add a new entry with the following values:
    • Application: All Applications (or you can choose just a specific app if desired)
    • Menu Title: Define in OmniDictionary
    • Keyboard Shortcut: (whatever you want that doesn't conflict with existing shortcuts)
  • Quit and restart any applications that are running in which you want to use the OmniDictionary Service.

You should now be able to use your newly-defined shortcut to invoke the OmniDictionary Service, assuming that you spelled the menu title exactly correctly, that there are no shortcut conflicts, and that you restarted the app in question if it was already running. (My test case here was to map the Service to command-6, and I confirmed that this worked in the current OmniWeb beta, just FYI.)

Due to the way Service menu items get cached (or have in the past; not entirely confident of how much of a problem this still is), you may need to bring up the Services menu once after (re)starting your application just to force it to be populated.

I was unable to use this to override OmniWeb's command-= mapping (much to my disappointment). I'm pretty sure that OmniWeb has special command-= handling to map it to command-+ since so many people complained about having to press the shift key to get the command-+ shortcut (and other apps had added the same shortcut). I don't know if you can override normal built-in shortcuts as I haven't explored that much.