Remove iTunes and Mac App store results when looking for a word I would like to know whether it is possible to remove the Itunes Store and Mac App Store results from the word look-up functionality in El Capitan 10.11.1, illustrated below:



and App Store:



I find the attached look-up results pointless and irrelevant.
As you can see here, you can disable some "Search results" from Spotlight or Look up. You can also uncheck the option "Allow Spotlight Suggestions in Spotlight Look up", to prevent Look up to work as Spotlight does.

This link can also be useful (it refers to Yosemite but the same functionalities are available for El Capitan too).