text: what is the noun of "exist"?   existence.   main entry: ex·is·tence pronunciation: ig-'zis-t&n(t)s function: noun  1 a obsolete : reality as opposed to appearance  b : reality as presented in experience  c (1) : the totality of existent things (2) : a particular being   d : sentient or living being : life  2 a : the state or fact of having being especially independently of human consciousness and as contrasted with nonexistence  b : the manner of being that is common to every mode of being  c : being with respect to a limiting condition or under a particular aspect  3 : continued or repeated manifestation