Our definitions of success have certainly changed over the years.
Earlier in my career, I generally defined success in terms of my title and salary, how those things determined my status in society, and how much I could contribute to my family.
I think that this self-contextualized view of success is pretty familiar to most people. We tend to think of it in personal terms.
These days, I view success more in terms of a foundational right of all people, particularly when it comes to the role (and goals) of education in our society.