Definition of Atlantis noun from the Oxford Advanced American Dictionary

 

Atlantis

 noun
noun
NAmE//ətˈlæntəs//
 
[uncountable]
 
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(in stories) an island full of beauty and wealth, which was said to have been covered by the ocean and lost. There are many stories about people's attempts to find it.
See the Oxford Advanced Learner's Dictionary entry: Atlantis