1.The achievement of something desired, planned, or attempted.
2. Gaining of fame or prosperity.
3.Extent of such gain.
4.One that is successful.
5.Obsolete. A result or an outcome.
Most of us would probably agree with definition 1. After all, how can you know you have achieved success if you have not worked toward a desire, followed a plan, or tried to reach a target, goal, or objective? But does that mean, then, that success is solely an end result of an action or series of actions?
See definition 4-the dictionary tells us that definition is obsolete. So if we have not achieved something desired, planned, or attempted, we can still be successful. 3 and 4 is success is the gaining of fame or prosperity and the extent of that gain. We all get can get fifteen minutes of fame, but let's focus on "prosperity" and "the extent of" that prosperity, which must be some kind of a favorable gain.