I have just upgraded to iOS10 and found that the "Define" feature (that appears after selecting a word) has been replaced with "Look Up", which now
pulls the suggestions from various sources on internet besides the local dictionary.
Is there a way to restrict this "Look Up" feature to search in local dictionaries alone? I couldn't find any solutions on the internet as of today (14th Sep16).
Best Answer
The instructions are in the "About Lookup & Privacy" that you read before using it for the first time... I can't figure out how you could get to see that a second time, fortunately I grabbed a screenshot while I was there.
Settings > General > Spotlight Search - disable Suggestions, for Search &/or Look up.