合ごう理りごうりCommon word›JLPTN2›Freq.FrequencyTop 10,000じ字FuriganaMeanings1nounrationality; reasonablenessAn abstract noun for being in accordance with reason, logic, or sound principles. In everyday writing, 合理的 is often used for 'rational' and 合理性 for 'rationality as a quality,' while 合理 itself appears in more abstract contrasts such as 合理と非合理.合ごう理りと非ひ合ごう理りの境