Question

What is the definition of empirical evidence?

Empirical evidence is evidence based on personal experience.
Empirical evidence is evidence based on scientific research.
Empirical evidence is evidence based on accepted truths.
Empirical evidence is evidence based on historical facts.

Answer 1

The best choice is: "Empirical evidence is evidence based on scientific research."

Briefly: empirical evidence is information acquired by observation or experimentation — measurable, observable data used to support or refute hypotheses. Personal experience can be empirical in a loose sense (it's observational), but in science it usually must be corroborated and collected under controlled or reproducible conditions. "Accepted truths" and "historical facts" are not the definition.