Usage Note
Fundacional describes something that establishes or constitutes a foundation — a foundational text, moment, or act. It is a formal, often academic or political adjective: el documento fundacional de la democracia. It does not change for gender (invariable: el texto fundacional, la asamblea fundacional).
Examples
"El acta fundacional fue firmada en 1978."
Natural Translation
The foundational charter was signed in 1978.

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