That's a "fair" question

I have a question about "fair".

Boss: Why you left your previous workplace? Interviewer: That's a "fair" question...

What does "fair" mean? Does it mean good, reasonable, agreeable, or others? Does it mean that the interviewer think this is a good question? Or, does the interviewer think this question should be known by the boss?

Thank you.

Solution 1:

I think you must mean interviewee (= the person being interviewed), not interviewer (= the person doing the interviewing).

Anyway: in this context, 'fair' means reasonable. In other words, the interviewee thinks it is a question that the boss is entitled to ask (presumably because it is relevant to the boss's decision regarding whether to hire the interviewee).