Definition of edge
What is meant by "edge" is an advantage. A player who has a edge on you is a player who will win over you in the long run. A player's edge can be scored in several ways. If you have better bases than your opponents, you have a edge. Even when you have the same bases, you can have a edge on a player if you have slept better, eaten better, are calm and zen. A tilted player loses a big part of his edge. When playing one-on-one poker, you'll always want to make sure you have a edge on your opponent to make sure you'll win on him in the long run.
What's your edge?
At some high limit cash games game tables, players sitting at the table often have the same technical poker skills. Their way of scoring their "edge" is to always stay calm and consistently play their A-Game. If two identical players are playing against each other, but one of them has better concentration than the other, he will get a edge. In recent years, "mental game" coaches have become much more popular. Players have come to realize the importance of a zenith of mind when playing!