Extracting commentary from separate discusion.
—If we're to be honest about what the original issue in the current debate started as, it wasn't a need for a "definition" for trivia as the opening discussion title suggests.
⸻Any questions about the definition were addressed long ago when the stigma of the word "trivia" in the context of the wiki was removed. Before the current debate, in an earlier matter, months ago now, Nemo misunderstood the word and originally refused to put any of his contributions into sections under that heading. At the start of that discussion, it was not recognized that Nemo didn't understand the definition of the word and addressing that prior issue of the content appears to have built up resentment in his mind as I understand it.
The underlying issue may simply be a lack of experience and a fear of being judged as unknowledgeable. Experience should dispel that fear with the acceptance that everyone is less knowledgeable than everyone else on some subject matter or another. It may perhaps be the case that many people who contribute to wikis like to think they are more knowledgeable and are in some way trying to show off. It might be healthier to be mindful that there's always someone who knows more than us on many things but we happen to be more knowledgeable than that same person on other subject matters. Others may simply have a broader experience. A question to consider is whether we want to benefit by learning from the broadest experiences shared to us by others.
The older we get the more we learn that we don't know. On the other hand, the older we get the more opportunities we have to build enormous obstinance and enormous fear.