Usage Note
Basar is almost always reflexive in practice: basarse en means 'to be based on' (la película se basa en hechos reales). The transitive form (baso mi argumento en datos) is less common but correct. Avoid confusing base (the noun, 'basis/base') with basar (the verb).
Examples
"El juez basó su decisión en las pruebas."
Natural Translation
The judge based his decision on the evidence.
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