Hello Julia, **"Where are you waiting for" doesn't exist . **"What are you waiting for?" When you wait for something or someone, you spend some time doing very little, because you cannot act until that thing happens or that person arrives. This question could be a rhetorical one, which is asked in order to make a statement rather than to get an answer. The person asking it is rather encouraging the other to act and not wait for things to happen. "There is nothing to wait for, you better act". It could be also a concrete inquiry about what the other person is waiting for. A- What are you waiting for? B- I am waiting for the school bus. ** I am not sure if the correct is "meaning OF" OR "meaning AS" ..? The correct form here is " has the same meaning AS".