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How to say "Theory" in Japanese

Both words can translate to "theory", but which should you choose?

Japanese Option A

期待可能性の理論

きたいかのうせいのりろん (kitaikanousei no riron)
C2 / CEFR Syllabus
VS
Japanese Option B

四原因説

しげんいんせつ (shigenn'insetsu)
C2 / CEFR Syllabus

Nuance Contrast & Translation Difference

When translating "theory" into Japanese, you must choose carefully between 期待可能性の理論 and 四原因説. In Japanese, 期待可能性の理論 (きたいかのうせいのりろん (kitaikanousei no riron)) is typically associated with "theory of expectability" (Syllabus Level: C2) and represents Essential structural term in CEFR C2 vocabulary syllabus.. On the other hand, 四原因説 (しげんいんせつ (shigenn'insetsu)) maps to "Theory of Four Causes" (Syllabus Level: C2) and represents Essential structural term in CEFR C2 vocabulary syllabus.. A literal translation of "theory" can often sound unnatural to native Japanese speakers if mixed up!
Bilingual Context for "期待可能性の理論"
私は期待可能性の理論に興味があります。
I am interested in theory of expectability.
Bilingual Context for "四原因説"
私は四原因説に興味があります。
I am interested in Theory of Four Causes.

Nuance Mastery Quiz

Which Japanese word perfectly fits this blank space?

Fill in the blank: "私は ___ に興味があります。" (Meaning: "I am interested in theory of expectability.")
🎉 Correct Answer!

Remember: "期待可能性の理論" fits here because it means "theory of expectability" in the context of: "I am interested in theory of expectability.". "四原因説" represents "Theory of Four Causes".

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