I'm not sure what's up with these people who go around commenting asking people to "define X" or "define Y" or "cite Z", but IMO it seems they generally have nothing interesting to say and aren't worth responding to. Just my 2c.
We've all heard there are facts and opinions, but there's a 3rd category I think: definitions.
And this is awful :(
It's normally the Worst Argument in the World: https://www.lesswrong.com/posts/yCWPkLi8wJvewPbEp/the-noncen...
Arguing about whether a definition is particularly useful or outlines a cluster of similar things can be good, but it's rare.
Certainly sometimes it's good to debate a word but this crossed the line into incessant requests for people to do work to come up with ever more definitions and citations.