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The ordinal form of the number five.
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(ellipsis or nominalization) The person or thing in the fifth position.
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One of five equal parts of a whole: one-fifth.
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(US) A quantity of liquor equal to one-fifth of an American gallon, or, more commonly, 750 milliliters (that is, three quarters of a liter).
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(music) The musical interval between one note and another five scale degrees higher (the fifth note in a scale)
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The fifth voice in a polyphonic melody.
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(music) To sing in the fifth voice in a polyphonic melody.
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(transitive, informal) To support something fifth, after four others have already done so.
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(transitive, nonstandard) To divide by five.