pure reason; pure logic
Abstract philosophical term for reasoning independent of experience or empirical data.
Proceed with the discussion based on pure reason.
彼の主張は純理の世界では正しいが、現実には通用しない。
His argument is correct in the realm of pure logic, but it doesn't hold in reality.
Compound of 純 (pure) and 理 (reason, logic). The exact historical derivation is uncertain, but the term is used in philosophical contexts.