1.AdjectivePertaining to or based on experience, as opposed to theory.
"The lengths were calculated according to the empirical rules of the trade.; For some presumptive diagnoses, empirical antibiotic therapy begins immediately, whereas specific antibiotic therapy must await the results of the culture and sensitivity test."
2.AdjectivePertaining to, derived from, or testable by observations made using the physical senses or using instruments which extend the senses.
3.AdjectiveVerifiable by means of scientific experimentation.
"demonstrable with empirical evidence"
4.NounA measurement or result achieved by empirical means.