empirical means in slang: Data that is proven to be true by observation and experimentation. (in Slang Dictionary, added by Adrianna Mercado)

What else does empirical mean?

Relying or drawing from experimentation or observation. (in Merlin Dictionary)

Verifiable and proven by observation or experiment. (in Merlin Dictionary)

Particularly in medicine, guided by experience rather than theory. (in Merlin Dictionary)