I'm talking about a large group experience. Depression for example is felt by millions, it's a shared experience that most of us can understand, but I'd like one word to describe the understanding we can feel for what ever the shared experience is because we've all experienced it. Empathetic, prevalent, pervasive, rampant is not really what I'm thinking.
regularly occurring within an area or community — Lexico
[Depression & stress as well as empathy, love, and sympathy are all endemic to nearly every culture; and there for people, world wide]
I don't think there is one. Before looking for a single word to describe something, one ought to check that there is such a word. Perhaps a better way to phrase your question would be:
Is there a single word to describe 'shared experience'?
To which, I would reply as above - No, I don't think so.
Perhaps relatable, but given your examples of what you aren't looking for, probably not.