derived from or guided by experience or experiment.
depending upon experience or observation alone, without using scientific method or theory, especially as in medicine.
provable or verifiable by experience or experiment.

1560–70; empiric + -al1

empirically, adverb
empiricalness, noun
antiempirical, adjective
antiempirically, adverb
nonempirical, adjective
nonempirically, adverb
overempirical, adjective
overempirically, adverb
semiempirical, adjective
semiempirically, adverb
unempirical, adjective
unempirically, adverb

1, 2. practical, firsthand, pragmatic.

1, 2. secondhand, theoretical.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
empirical (ɛmˈpɪrɪkəl)
1.  derived from or relating to experiment and observation rather than theory
2.  (of medical treatment) based on practical experience rather than scientific proof
3.  philosophy
 a.  a priori Compare a posteriori (of knowledge) derived from experience rather than by logic from first principles
 b.  analytic Compare synthetic (of a proposition) subject, at least theoretically, to verification
4.  of or relating to medical quackery
5.  statistics Compare mathematical probability See also posterior probability the posterior probability of an event derived on the basis of its observed frequency in a sample

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1560s, from L. empiricus, from Gk. empeirikos "experienced," from empeiria "experience," from empeiros "skilled," from en- "in" + peira "trial, experiment." Originally a school of ancient physicians who based their practice on experience rather than theory.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

empirical em·pir·i·cal (ěm-pēr'ĭ-kəl)

  1. Relying on or derived from observation or experiment.

  2. Verifiable or provable by means of observation or experiment.

  3. Of or being a philosophy of medicine emphasizing practical experience and observation over scientific theory.

em·pir'i·cal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
empirical   (ěm-pîr'ĭ-kəl)  Pronunciation Key 
Relying on or derived from observation or experiment.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He writes in a hardy, unpretentious style that is more empirical than
The empirical evidence that global warming does exist is blinding.
There's no empirical study that's ever been done that shows that punitive
  damages have any constructive function.
Anyone who eats a fruit, vegetable, or animal that is wild is putting empirical
  evidence of evolution into his or her mouth.
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