To me, being successful means...
What a question. For some reason I tend to think of my life now by how my kids are doing, my husband, myself and the state of other relationships I have in my life. When all of those things are hitting I feel successful but when they're not I don't. It seems too close-in and too short term for such a global definition but that's how I measure my life day to day. The bigger, grandiose definitions are wonderful and make for good quotes to remind myself of sometimes but I don't think anyone really stays true to them.   

My definition of success has changed over time. 
In high school it was about grades, sports and college ranking. In college it was grades, social status, job offers. In career it was work reviews, weddings and grad school. As a Mom, it's are my kids happy, having fun and learning. With my husband, right now, it's are we getting along, lol.