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fourth dimension the dimension of time, required according to the theory of relativity to completely specify an event in space-time.
fourth estate the news media of a country, considered as an entity with political power.
Fourth of July in the United States, Independence Day.
fourth world (often cap.) the countries of the world that are poorest in resources and capital and have the most poorly educated population; least developed countries.
fourth-class of or relating to a class next below the third, as for mailing, shipping, or the like. [2 definitions]