1. aimed at solving a problem, especially when this involves correcting or improving sth that has been done wrong

remedial treatment (= for a medical treatment)

Remedial action must be taken now.

Please kindly be advised that the G section lift is running following remedial works by our contractor yesterday.

The building needs urgent remedial work to make it safe.

2. connected with school students who are slower at learning than others

remedial education

a remedial class

She teaches remedial English