fourth /fōrth or förth/

1. Last of four
2. Next after the third
3. Equal to one of four equal parts

1. One of four equal parts, a quarter
2. A person or thing in fourth position
3. An interval of three (conventionally called four) diatonic degrees (music)
4. A tone at that interval from another (music)
5. A combination of two tones separated by that interval (music)

fourthˈly adverb

fourth dimension noun

1. That of time, as opposed to the three spatial dimensions
2. Anything which is beyond ordinary experience

fourth-dimenˈsional adjective

fourth estate noun

1. A group of people other than the lords, commons and clergy, who influence a country's politics
2. The press

fourth official noun (football)

An official who has responsibility for off-the-field activities such as substitutions, indicating additional time to be played, etc

Fourth of July noun

The anniversary of the adoption of the Declaration of Independence, a public holiday in the USA

fourthˈ-rate adjective

1. Of the fourth order
2. Inferior

fourth wall noun

An idea of the naturalistic theatre, that the open front of the stage-set represents as solid a wall as the other three sides

Fourth World noun

1. The poorest and least developed of the poor countries of the world
2. The poorest people in the developed countries

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• boobyish