Having English as my second language, there are many words that I don't know. As a result, I will need to open Dictionary most of the time.
If everytime I need to launch Dictionary.app to see the word definition, I will waste my precious time and decrease my productivity.
However, thanks to my Mac, with a simple keystrokes Ctrl-Cmd-D a quick dictionary pane will appear right in front of your eyes. If you failed to call the quick dictionary, it's possible that you've previously changed the shortcut. To change the shortcut back, follow these steps:
You can click on the thumbnail for larger view.
Unfortunately, this feature is not supported by some applications, like Firefox.
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