Also means
essential
Usage Note
Fundamental is invariable in gender and is slightly more formal than básico or esencial. It frequently collocates with abstract nouns: derechos fundamentales (fundamental rights), cambio fundamental. The adverb is fundamentalmente and the verb fundamentar means to ground or base something on a foundation.
Examples
"El respeto es fundamental en toda relación."
Natural Translation
Respect is fundamental in every relationship.

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