fourth dimension - Definition from Longman English Dictionary Online

fourth dimension
noun

fourth dimension

the fourth dimension

an expression meaning 'time', used especially by scientists and writers of science fiction

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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fourteen number

Fourteenth Amendment, the

fourth¹ adjective

fourth² pronoun

fourth³ noun

fourth dimension noun

fourth estate noun

Fowler, Henry Watson