a legendary island, first mentioned by Plato, said to have existed in the Atlantic Ocean west of Gibraltar and to have sunk beneath the sea, but linked by some modern archaeologists with the island of Thera, the surviving remnant of a much larger island destroyed by a volcanic eruption c1500 b.c.
mythical island-nation, from Gk. Atlantis, lit. "daughter of Atlas." All references trace to Plato's dialogues Timaeus and Critias, both written c.360 B.C.E.
A kingdom in classical mythology. According to legend, it was once an island in the Atlantic Ocean, was swallowed up in an earthquake, and is now covered by the sea.