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|Look up fourth in Wiktionary, the free dictionary.|
Fourth or 4th can refer to:
- Fourth, the ordinal number following third
- One quarter, ¼
- Preceded by the, refers to the United States holiday of Independence Day, celebrated on the Fourth of July.
- Perfect fourth, a musical interval between two notes 5 semitones apart
- Diminished fourth, a musical interval between two notes 4 semitones apart
- Augmented fourth, a musical interval between two notes 6 semitones apart
- The fourth degree of a musical scale
- Fourth (album), an album by Soft Machine
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