One Quickie

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Configuring control-shift-D dictionary contents (General->General)

When I go to define a word with control-shift-D, I'm not interested in wikipedia - just give me the definition.

This system-wide behavior isn't configured in the system preferences, instead in the prefs of the Dictionary App :-| . Go to the preferences, and you get a list of a ton of stuff. Turn off Wikipedia (or turn on / off whatever you want)