empirical

American  

[em-pir-i-kuhl] / ɛmˈpɪr ɪ kəl /

adjective

1. derived from or guided by direct experience or by experiment, rather than abstract principles or theory.

   Empirical evidence of changes in kelp consumption was gathered by measuring the bite marks in seaweed fronds.

   Synonyms:

   pragmatic, firsthand, practical

   Antonyms:

   theoretical, secondhand

2. depending upon experience or observation alone, without using scientific method or theory, and hence sometimes insufficiently authoritative, especially as in medicine.

   That is nothing but an empirical conclusion with no regard for the laws of thermodynamics.

   Synonyms:

   pragmatic, firsthand, practical

   Antonyms:

   theoretical, secondhand

3. provable or verifiable by experience or experiment, as scientific laws.

   Theoretical physics is criticized for producing complex concepts that are mathematical, not empirical.

---

empirical British  

/ ɛmˈpɪrɪkəl /

adjective

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

   1. (of knowledge) derived from experience rather than by logic from first principles Compare a priori a posteriori

   2. (of a proposition) subject, at least theoretically, to verification Compare analytic synthetic

4. of or relating to medical quackery

---

noun

1. statistics the posterior probability of an event derived on the basis of its observed frequency in a sample Compare mathematical probability See also posterior probability

empirical Scientific  

/ ĕm-pîr′ĭ-kəl /

1. Relying on or derived from observation or experiment.

---

Other Word Forms

• antiempirical adjective
• empirically adverb
• empiricalness noun
• nonempirical adjective
• overempirical adjective
• semiempirical adjective
• unempirical adjective

Etymology

Origin of empirical

First recorded in 1560–70; empiric + -al ¹

Compare meaning

How does empirical compare to similar and commonly confused words? Explore the most common comparisons:

• empirical vs. theoretical
• empirical vs. molecular formula
• empirical vs. molecular

Example Sentences

So the Newsom and Cox campaigns opened a private back-channel, trading gossip, swapping insights on the race and even sharing some empirical data.

From Los Angeles Times • Mar. 29, 2026

They then have an empirical, evidence-based allocation appropriate to their lifestyle, personality and investment approach.

From The Wall Street Journal • Mar. 10, 2026

It is less a sudden ideological turn and more a downstream effect of years of empirical work.

From Barron's • Feb. 2, 2026

“There wasn’t a robust empirical analysis of: How do child care prices affect fertility rates?”

From Salon • Jan. 25, 2026

How can we account for the empirical observation that band or tribal organization just does not work for societies of hundreds of thousands of people, and that all existing large societies have complex centralized organization?

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond

Related Words

• experimental
• factual
• observational