Definition of "empirical"

empirical

/ɪmˈpɪɹɪkəl/

adjective
comparative more empirical, superlative most empirical
1. (often, in contrast with having a basis in theoretical explanation) .
  Quotations
  The village carpenter […] lays out his work by empirical rules learnt in his apprenticeship.
  1861, Herbert Spencer, Education
2. Pertaining to, derived from, or testable by observations made using the physical senses or using instruments which extend the senses.
3. (philosophy of science) Verifiable by means of scientific experimentation.