1.
cause, origin, source
The reason why something happens or exists.
Related Words
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理由 (reason (justification))
Antonym:
結果 (result, outcome)
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要因 (factor, contributing cause)
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訳 (reason, meaning)
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因果関係 (causal relationship)
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根源 (root)
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原動力 (driving force)
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発生源 (source)