逻辑 (luó jí) is a noun meaning 'logic'—the systematic study of valid reasoning, argument structure, and principles of correct inference. Though borrowed from Greek via Japanese in the late 19th century, it is now fully integrated into modern Chinese academic and everyday language. The first character 逻 (luó) originally meant 'to patrol' or 'to search', suggesting investigation; the second 辑 (jí) means 'to compile' or 'to organize', implying systematic arrangement. Together, they evoke the idea of methodically organizing thought to uncover truth.

This word appears frequently in education, philosophy, computer science, law, and even casual speech—for example, when questioning the coherence of an argument ('你的逻辑有问题' — 'Your reasoning is flawed'). It’s also used in compound terms like 逻辑思维 (logical thinking) and 形式逻辑 (formal logic). Unlike English, Chinese rarely uses 逻辑 as a verb or adjective without modification.