Definition of Atlantis noun from the Oxford Advanced Learner's Dictionary

 

Atlantis

 noun
noun
BrE BrE//ætˈlæntɪs//
 
; NAmE NAmE//ætˈlæntɪs//
 
[uncountable]
 
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(in stories) an island full of beauty and wealth, that was said to have been covered by the sea and lost. There are many stories about people’s attempts to find it.
See the Oxford Advanced American Dictionary entry: Atlantis