The reaching of what was aimed at. Success is measured against a stated aim, which is why an unstated aim can never be met.
Latin successus (an advance, a favourable outcome), from succedere (to follow closely, to turn out well); a stated aim was always what success is measured against, which is why the Latin word for coming after doubled as coming out well.
The reaching of what was aimed at. It is measured against a stated aim, which is exactly why an aim never stated can never be met.