fundamental reason
definitions
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The most basic, essential, or underlying cause or explanation for a situation, event, or belief.fr: Raison fondamentale
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A primary principle or logical basis that serves as the foundation for a theory, argument, or system of thought.fr: Raison de base
examples
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The fundamental reason for the company's failure was poor management.
La raison fondamentale de l'échec de l'entreprise était une mauvaise gestion.
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Justice is the fundamental reason behind our legal system.
La justice est la raison fondamentale de notre système juridique.