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The Collaborative International Dictionary of English v.0.48 (gcide)

Fourth \Fourth\, a. [OE. fourthe, ferthe, feorthe, AS.
fe['o]r[eth]a, fr. fe['o]wer four.]
1. Next in order after the third; the ordinal of four.
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2. Forming one of four equal parts into which anything may be
divided.
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Fourth \Fourth\, n.
1. One of four equal parts into which one whole may be
divided; the quotient of a unit divided by four.
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2. (Mus.) The interval of two tones and a semitone, embracing
four diatonic degrees of the scale; the subdominant of any
key.
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3. One coming next in order after the third.
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{The Fourth}, specifically, in the United States, the fourth
day of July, the anniversary of the declaration of
American independence; as, to celebrate the Fourth.
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