The process of helping someone to stop taking drugs or alcohol. (Cambridge Dictionary)
Rehab is the process of helping someone to lead a normal life again after they have been ill, or when they have had a drug or alcohol problem. Rehab is short for rehabilitation. (Collins Dictionary)
A course of treatment for drug or alcohol dependence, typically at a residential facility. (Oxford Dictionaries)
A building that has been rehabilitated or restored. (Oxford Dictionaries)
The action or process of rehabilitating. (Merriam – Webster)
Going to Rehab and Discovering the Meaning of Life.
Musculoskeletal (Orthopedic) Rehabilitation.
Living a Life of Purpose: Find Support in Meaning – RehabSpot.