fundamental reason
definitions
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The most basic, essential, or underlying cause or explanation for a situation, event, or belief.es: Razón fundamental
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A primary principle or logical basis that serves as the foundation for a theory, argument, or system of thought.es: Principio fundamental
examples
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The fundamental reason for the company's failure was poor management.
La razón fundamental del fracaso de la empresa fue la mala gestión.
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Justice is the fundamental reason behind our legal system.
La justicia es la razón fundamental de nuestro sistema legal.