To return to an original state; "the recovery of the forest after the fire was surprisingly rapid" convalescence: gradual healing (through rest) after sickness or injury the act of regaining or saving something lost (or in danger of becoming lost). In terms of codependency, recovery is you regaining your own life.
Returning to the original you, prior to codependent issues overtaking your life. Saving yourself. Alternately, here's another view of recovery; At any given time, there are a number of people who are working, deliberately and through particular disciplined behaviors, to end their dependence on alcohol or drugs.
The term "recovery" can serve as convenient shorthand for that complex and difficult effort. For some, the term has a more definite meaning. Those people, usually encouraged by the programs that they are using to end their addictive behaviors, think of themselves as being "in recovery", and they contrast that state with the state of being "in relapse" - i.e. actively drinking and drugging.
To such individuals, recovery is more than convenient shorthand; they view recovery as the condition in which they intend to spend the rest of their lives, and remaining in recovery, for them, is quite literally a matter of life or death.