Definify.com

Webster 1913 Edition

adv.

By experiment or experience; without science; in the manner of quacks.

adv.

By experiment; according to experience; without science; in the manner of quacks.

empirically ‎(comparative more empirically, superlative most empirically)

Based on experience as opposed to theoretical knowledge.
I have no idea why this works, but empirically, it works.
(sciences) Based on data gathered in the real world.
We need to test this idea empirically instead of just speculating about it.

based on experience as opposed to theoretical knowledge

based on data gathered in the real world