Existence
noun, verbal noun
I exist, I suppose... this is the kind of existence I have. I'm not really sure either way, and I don't care. Existence is futile, I suppose.
そんざい
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
SNSをしないので、そのミームの存在を知りませんでした。
I don't use social media, so I didn't know that meme existed.
ルールは守るために存在するんですよ。
Rules exist to be followed.
彼は宇宙生活が長かったので、時々、重力の存在を忘れることがあります。
He has lived so long in space, that he sometimes forgets that gravity exists.