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Definition of the fourth dimension noun from the Oxford Advanced Learner's Dictionary

the fourth dimension

noun

/ðə ˌfɔːθ daɪˈmenʃn/,

/ðə ˌfɔːθ dɪˈmenʃn/

/ðə ˌfɔːrθ daɪˈmenʃn/,

/ðə ˌfɔːrθ dɪˈmenʃn/

[singular]

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(used by scientists and writers of science fiction) time

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noun

From the Word list

A1

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