"empirical" in the adjective sense
1. empirical, 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"
2. empiric, empirical
relying on medical quackery
"empiric treatment"
Source: WordNet® (An amazing lexical database of English)
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