There are four civilizations (different from dispensations):
1). Antediluvian Civilization: began with Adam and ended with judgment by the flood.
2). Post-diluvian Civilization: began with Noah and family after flood and ends with Second Advent of Christ and Baptism of Fire.
3). Millennial Civilization: begins with Tribulation saints and terminates with unbelievers being cast into lake of fire.
4). Eternal Civilization: begins with all believers in resurrection bodies; new heaven and new earth; divine blessing forever.