To me, eternity means something that is never forgotten. That which is lost can be remembered and it continues its existence within eternity. Without something being known, does it truly exist?

I know there was something the human race found that didn't exist unless it was perceived by an individual. They received different results when observing the 'object' than when not perceiving it.

So Eternity is everything around us. Some of it is known and remembered, but also things that are forgotten and will eventually be remembered. An odd answer, but one that I wished to share.