empiric -
derived from experiment and observation rather than theory; "an empirical basis for an ethical theory"; "empirical laws"; "empirical data"; "an empirical treatment of a disease about which little is known"
experiential,
existential derived from experience or the experience of existence; "the rich experiential content of the teachings of the older philosophers"- Benjamin Farrington; "formal logicians are not concerned with existential matters"- John Dewey