Other forms: empiricisms
Empiricism means a method of study relying on empirical evidence, which includes things you've experienced: stuff you can see and touch.
Empiricism is based on facts, evidence, and research. Scholars and researchers deal in empiricism. If you believe in the Easter Bunny, the Tooth Fairy, or Santa Claus, you're out of the realm of empiricism — there are no facts to support those myths. If you want to get something practical done, or to really know what the deal is with something, empiricism is the way to go.