Origin: Latin suffix -al
Remedial has 3 different meanings across 1 category:
tending to cure or restore to health
"curative powers of herbal remedies"
"her gentle healing hand"
"remedial surgery"
"a sanative environment of mountains and fresh air"
"a therapeutic agent"
"therapeutic diets"
curative; providing a remedy
"The remedial exercises helped restore function to his injured knee after surgery."
In plain English: Remedial means something designed to help you fix mistakes and catch up on what you missed so you can get back on track.
"She took remedial math classes to improve her grade before college."
From Latin remediālis. By surface analysis, remedy + -al.