What makes an 'expert in martial arts'?

[singularity6]

Just to nitpick, the definition of “comprehensive or authoritative knowledge” would be more accurate if it said “and” instead. They are indeed different, but possessing both is what makes the basic definition of an expert. In other words, a martial arts expert is simply someone who is highly skilled and who serves a reference or example by others who train in the same system. Someone whom others will consult, listen to and follow to get important insight into what they practise. It should also be noted that even among experts, there are different levels and not all experts have a far-reaching reputation, nor do they seek it. Some are not even recognized as experts until later in their life or after their passing.

You are correct. My mistake.