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.
Compare Akrotiri. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Atlantis (ətˈlæntɪs)
(in ancient legend) a continent said to have sunk beneath the Atlantic Ocean west of the Straits of Gibraltar

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

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.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

Atlantis definition

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.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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