The Dictionary of Theological Terms defines "revival" as "a quickening and kindling of spiritual life in an individual Christian, church, community, or country. In this view it is a work of God’s Spirit, dispelling the darkness and deadness of spiritual declension."
Revival is an activity of Holy Spirit that is evidenced in the changed lives of people. God's power and presence is overwhelmning and is infectious. True revivals leave lasting marks to those who have truly experienced it.