1. The period after a flooding of an area: The postdiluvian that took place after the heavy rain and which affected many families along the river fortunately was not very destructive.
2. The time after the flood as indicated in the Bible: According to the Bible, it took 150 days for the postdiluvian to take place before the water dropped low enough to let the ark with Noah and the others come to rest on a mountain in the region of Armenia known as Ararat.