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Base noun form. Used to refer to a theory, doctrine, or explanation. Often appears in compound words with other kanji to specify the type of theory.
Theme

In a university seminar, User discusses scientific theories with their professor, Professor Tanaka.

せつ

theory

Advanced ExpansionAbstract Concepts

Memory Hook

Imagine a scientist explaining a 'theory' with a 'set' of ideas — 'set' sounds like 説 (setsu). 'Set theory' → 説 (setsu, 'theory').

Cultural Note

In Japanese academic and media contexts, 説 (setsu) is often used in compound words like 『進化論』 (shinkaron, 'theory of evolution') or 『陰謀説』 (inbōsetsu, 'conspiracy theory'), reflecting its role in discussing ideas and hypotheses.

Forms

Base: 説Base noun form. Used to refer to a theory, doctrine, or explanation. Often appears in compound words with other kanji to specify the type of theory.