I would like to know why retenir means "to learn" here and not apprendre
Ivie, not sure which example or section gives rise to your question ?
However, words can have more than one meaning depending on context, and it would be unusual to have only 1 word in a language to describe an abstract idea or concept, or even for a specific physical ‘thing’.
Retenir and tenir are very commonly used in French in a number of different contexts and expressions :
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