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Perfect! Thanks Shawn.

Thanks Shawn!

I added a killall Terminal command which quits the Terminal application after opening the dictionary. Not sure it if this is the most elegant way, but it works.

open dict://{query}
killall Terminal

Thanks again! Unfortunately it is passing the selected text if set to "pass through to workflow". I've played 

Here's a link to the workflow as of now.

Thanks @Ritashugisha, unfortunately I couldn't make it work either. Basically I want to create a script that diplays the OSX Thesaurus for the selected text. Trying to get the Dictionary to open is just the first step.

Nothing happens when the Hotkey is pressed. Why?