Empirical (adjective)

1. Based on, concerned with, or verifiable by observation or experience rather than theory or pure logic.
2. Relying on experience or observation alone, often without due regard for system and theory.

Origin:

From latin empīricus, from greek ἐμπειρικός (empeirikos), from ἐν (en, "in") + πεῖρα (peira, "experience").

Examples:

1. Empirical data supports the hypothesis.
2. The empirical evidence for the theory is weak.
3. The research is based on empirical observations.
4. Empirical knowledge is gained through experience.
5. Empirical research is based on data collected through observation and experimentation.