Usage Note
Fiabilidad is the standard Spanish term for reliability or trustworthiness, especially for systems, data, or sources (fiabilidad de los datos = data reliability). In Latin America confiabilidad is more common in technical contexts. The related adjective is fiable (reliable), which is primarily a Spain usage; Latin America favors confiable.
Examples
"La fiabilidad del sistema se ha puesto en duda."
Natural Translation
The reliability of the system has been called into question.
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