When used in this chapter, unless otherwise expressly stated or unless the context otherwise requires:
55. "Addiction disorder services" or "addiction services" shall mean engagement to treatment, examination, evaluation, diagnosis, care, treatment, rehabilitation, relapse prevention and recovery maintenance, and related education and training of persons suffering from or recovering from an addictive disorder and their significant others.
Unless otherwise provided, for the purposes of this chapter, the term addiction disorder services shall mean and include "chemical dependence services," alcoholism and/or substance abuse services, substance use disorder services, substance dependence, and gambling disorder services.