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English definition of “in a world of your own”

in a world of your own

(also in another world)
thinking your own thoughts and ideas and not giving much attention to what is happening around you: When she was young, she lived in a world of her own and had very few friends.Continually thinking aboutAloneSeparateness and isolation in space
(Definition of in a world of your own from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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