When you do poorly in a subject and get sent to a class that focuses on basic concepts and better study habits, you are taking a remedial class.

If you know that a remedy is a type of medicine, then you have a clue to the meaning of remedial. Like a remedy, remedial classes are supposed to improve you, specifically in school subjects that you haven't done well in. Lately, the term is most often used to describe courses given to students who are not prepared for regular work. New college students often have to take remedial classes before they can begin actual university-level courses.

Definitions of remedial

adj tending or intended to rectify or improve

“a remedial reading course”
remedial education”
changing for the better

adj tending to cure or restore to health

remedial surgery”
alterative, curative, healing, sanative, therapeutic
conducive to good health of body or mind

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