What is the definition of the term "perseverance of the saints"?

The definition of "perseverance of the saints," is the teaching that the saints will definitely persevere in the faith, both in belief and in action.

This view generally does not recognize the existence of carnal Christians. It insists that a true believer will definitely persevere to the end. That is a bit different from the concept of "eternal security" which teaches that the work of regeneration cannot be undone and that a person truly saved will never be lost, either by sinning or by ceasing to believe. In the view of eternal security, the maintaining of salvation is based upon the perseverance of God.