Also means
extra copy; backup (document)
Usage Note
Refuerzo comes from reforzar ('to reinforce, to strengthen'). In an educational context clases de refuerzo are remedial or extra-support classes. In construction and military usage it means structural or tactical reinforcement. Refuerzo positivo ('positive reinforcement') is a common term in psychology and pedagogy.
Examples
"El alumno necesita clases de refuerzo en matemáticas."
Natural Translation
The student needs extra-support classes in maths.
Related Words
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