Source : Webster's Revised Unabridged Dictionary (1913)

Empirically \Em*pir"ic*al*ly\, adv.
   By experiment or experience; without science; in the manner
   of quacks.

Source : WordNet®

empirically
     adv : in an empirical manner; "this can be empirically tested"
           [syn: {through empirical observation}, {by trial and
           error}] [ant: {theoretically}]