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Is there a native dictionary on OSX?

I would like to be able to click on a word (in any open window), and get its meaning in a quick popup windows.

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If for any reason you can't select the word, bring up Spotlight (⌘-Space, or click the magnifying glass icon in the upper-right corner) and type the word in to the search box. The definition will be shown if it's in the dictionary. – Andrew Medico Aug 20 '14 at 17:03
up vote 11 down vote accepted

Mouse over a word and tap the trackpad with three fingers, or enable the Dictionary service in System Preferences to assign a keyboard shortcut (by default, it's ⌃⌘D).

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Fantastic! That's the tool I need. – Adam Matan Aug 20 '14 at 12:44
Side note: by default, Mavericks assigns ⌃+⌘+D (control+cmd+D) to open the Dictionary for whatever word your cursor is currently over. – aglasser Aug 20 '14 at 14:14

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