Look up a word in a new tab in Dictionary
In Dictionary, to look up a word in a new tab, Control-click the word, then choose "Look Up in New Tab" from the pop-up menu.
Increase or decrease font size in Dictionary
In Dictionary, press Command-Plus (+) or Command-Minus (-) to increase or decrease font size.
Revert to an original dictionary name in Dictionary
In Dictionary, if you've renamed a dictionary, to change it back, Control-click its label in the source bar, then choose Revert to Original Label from the pop-up menu.
Look up a word in a definition in Dictionary
In Dictionary on a Mac with a Multi-Touch trackpad, to look up a word seen in a definition, tap the word once with three fingers.
Enable the Spanish-English translation dictionary in Dictionary
In Dictionary, to enable the Spanish-English translation dictionary, choose Dictionary> Preferences, then select Gran Diccionario Oxford.
Filter inappropriate words in Dictionary
In Dictionary, to filter inappropriate words, set up parental controls in System Preferences>Parental Controls, then select "Hide profanity in Dictionary" in the Other pane of the Parental Controls preferences.
Rename a dictionary in Dictionary
In Dictionary, to rename a dictionary in the source bar, Control-click its name, then choose Edit Label from the pop-up menu.
Navigate back through your word lookup history in Dictionary
In Dictionary on a Mac with a Multi-Touch trackpad, swipe left with two fingers to navigate back through your word lookup history.
Open your Dictionaries folder
In Dictionary, to open your Dictionaries folder in the Finder, choose File> Open Dictionaries Folder.
View larger versions of illustrations in Dictionary
In Dictionary, when looking up words containing illustrations, click the illustration to view a larger version, if one is available.
Go to a source in Dictionary
In Dictionary, press Command-1 through 9 to go to a source in the order that they appear in the toolbar.
Quickly jump to the search field in Dictionary
In Dictionary, to quickly jump to the search field, to search for a new word, press Option-Command-F.
Search for a word using all reference sources in Dictionary
In Dictionary, to search for a word using all reference sources at once, click All in the source bar, or choose Search> All Dictionaries.
Adjust the font size in Dictionary
In Dictionary, to adjust the font size used to display definitions, click the “A" button in the toolbar.
Select the next reference source in Dictionary
In Dictionary, press Command-Shift-Right Bracket to select the next dictionary reference source.
Navigate forward through your word lookup history in Dictionary
In Dictionary on a Mac with a Multi-Touch trackpad, swipe right with two fingers to navigate forward through your word lookup history.
Reorder reference sources in Dictionary
In Dictionary, to set the order in which reference sources are displayed, choose Dictionary> Preferences and drag the sources into the order you prefer.
Select the previous reference source in Dictionary
In Dictionary, press Command-Shift-Left Bracket to select the previous dictionary reference source.
Open definitions for words in separate windows in Dictionary
In Dictionary, Command-click on any word in a definition to open the definition for that word in its own separate window.
Change the default font size in Dictionary
In Dictionary, to change the default font size in which entries are displayed, choose Dictionary> Preferences, then choose a size from the "Font size" pop-up menu.
Show a list of recently-defined words in Dictionary
In Dictionary, press and hold the left or right arrow buttons in the toolbar to show a pop-up list of recently-defined words.
Access additional reference material in Dictionary
In Dictionary, choose Go> Front/Back Matter to access additional reference material such as language guides, history timelines, chemical element info, etc.
Teach the Mac OS X dictionary new words
To teach the built-in Mac OS X spell checker new words (such as proper names), Control-click the word and choose "Learn Spelling".