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Definition of empirical : 1. Depending upon experience or observation alone, without due regard to science and theory; - said especially of medical practice, remedies, etc.; wanting in science and deep insight; as, empiric skill, remedies.
2. Pertaining to, or founded upon, experiment or experience; depending upon the observation of phenomena; versed in experiments.

Synonyms:

existential, empiric, objective, checkable, provable, observational, confirmable, practical, a posteriori, data-based, observed, falsifiable, trial and error, pilot, anatomize, supportable, dissect, verifiable, detection, animal rights, model, detect, semiempirical, control, sustainable, chromatography, experiential, demonstrable, double-blind, biopiracy

experimental (part of speech: adjective)

hit-or-miss, benchmarked, unproven, probative, trial, tentative, experimental, test, investigative, analytical, unverified

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