An example of rational is the provable idea of gravity.
An example of rational is a person who apologizes after an argument when he knows he was at fault.
A rational argument.
Wondered if the eccentric neighbor was not completely rational.
Origin of rational
- Middle English racional from Old French racionel from Latin ratiōnālis from ratiō ratiōn- reason reason
From American Heritage Dictionary of the English Language, 5th Edition