Usage Note
Fidelización is a business and marketing term for the process of building and retaining customer loyalty — closer to 'loyalty-building' than simply 'loyalty' (fidelidad). It is used in phrases like programa de fidelización (loyalty scheme). The related verb is fidelizar (fidelizar a los clientes).
Examples
"El programa de fidelización aumentó las ventas."
Natural Translation
The loyalty programme increased sales.

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