I can't think of any other definition of "closest" than "separated by the fewest spaces".
The question was already answered. No need to add in your snarky response...especially saying you can't think of ANY other definition. You're smart enough to think of other definitions. How about "the fewest centimeters from the x?" The fact this question keeps coming up shows there are real, dictionary definitions that are not simply "space" oriented.
Derek is right: yes to both of your questions.