1.
to have a point; to make sense; to be reasonable
Acknowledges that someone's opinion or argument has some merit or logic to it, even if one does not fully agree. Literally means 'there is one reason/logic.' Composed of 一 (one) + 理 (reason) + ある (to exist).
Usage
Often used to partially acknowledge an opposing viewpoint before stating disagreement: 「一理あるが…」 (You have a point, but...). The expression conveys measured, rational assessment rather than enthusiastic agreement.
This expression sounds thoughtful and balanced. It is commonly used in discussions and debates to show fair-mindedness.