There is no single definition of recovery. Many people interpret recovery to be complete abstinence, while others believe this term is synonymous with remission, and still others associate recovery with quality of life indicators.
See the table below for a progression of different definitions of recovery over time:
Kelly, J. F., & Hoeppner, B. (2015). A biaxial formulation of the recovery construct. Addiction Research & Theory, 23(1), 5-9.