What is success?

In business, you hear talk about succesful companies all of the time. Other companies try to copy those companies. Churches tend to do the same thing. Copy whatever works somewhere else. Whatever creates a buzz is sure to be emulated elsewhere. The thing is that those that are successful today, may be gone tomorrow. What works to create their success today, may disappear before they know it. Success can be fleeting for organizations or it can last over the long haul. All of this to say, how do you determine if you are successful in life? Most tend to measure personal success by the amount of money, or fame or power that you have. Like in business, those can seemingly disappear overnight. So what is the gauge you use to determine if you are successful personally? Is there something tangible to measure against to tell if you are successful or is it just a feeling? Does it even matter if we are successful? Just curious about a word that I hear thrown around a lot but no one ever really defines.