Also means
regulation
Usage Note
Regularización is frequently used in administrative, immigration, and labour-law contexts — regularización de inmigrantes, regularización del empleo. It carries the specific sense of bringing something irregular into formal compliance, not merely 'regulation' in an ongoing sense (for which regulación is preferred). The plural is regularizaciones.
Examples
"El gobierno aprobó la regularización de los trabajadores."
Natural Translation
The government approved the regularisation of workers.

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