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Mac OS X Lion introduced a new feature where in many applications you can press Command-Control-D to produce a popup with the definition for the word under the mouse cursor. A side effect of this is that you can no longer use the same shortcut to access functionality in other applications (for example, Emacs).

Is it possible to either

a) disable the word definition Command-Control-D keyboard shortcut, or
b) change the word definition keyboard shortcut to something other than Command-Control-D?

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It can't be reassigned in DefaultKeyBinding.dict. There's nothing promising in com.apple.Dictionary.plist. defaults write com.apple.Dictionary ProhibitNewWindowForRequest -bool true (listed in Secrets under Dictionary (10.4)) no longer works. – Lri Aug 22 '11 at 18:31
Thanks for checking, Lri. For what it's worth, I looked in com.apple.symbolichotkeys.plist. No dice. – Zane Shelby Aug 22 '11 at 19:48
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(First, this certainly isn't new — it's been around since Leopard, I belive.)

Unfortunately, it doesn't look like there's currently a way to disable or change it in Lion. You can add/change a shortcut for the "Look Up in Dictionary" Service, but this doesn't change the behavior of control-command-D. File a bug if you have a developer account, and for now, learn to live with it :(

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In Snow Leopard the global shortcut didn't 'shadow' or override application shortcuts. – Zane Shelby Aug 22 '11 at 6:22
True. Yes, this is a disappointing behavior. It doesn't really bother me because I actually use control-command-D to look up words. – jtbandes Aug 22 '11 at 6:24
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