fifth

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The ordinal number matching the number five in a series.
2. n. One of five equal parts.
3. n. One fifth of a gallon or four fifths of a quart of liquor.
4. n. Music A tone five degrees above or below a given tone in a diatonic scale.
5. n. Music The interval between two such tones.
6. n. Music The harmonic combination of two such tones.
7. n. Music The dominant of a scale or key.
8. n. The Fifth Amendment. Used with the.

Century Dictionary and Cyclopedia

1. Next after the fourth: an ordinal numeral.
2. n. The quotient of unity divided by five; one of five equal parts of anything: as, one fifth (⅕) of an acre.
3. n. In music: A tone five diatonic degrees above or below any given tone.
4. n. The interval between any tone and a tone five degrees distant from it.
5. n. The combination of two tones distant by a fifth.
6. n. In a scale, the fifth tone from the bottom; the dominant: solmizated sol, as G in the scale of C, or E in that of A. The typical interval of the fifth is that between the first and fifth tones of a diatonic scale, acoustically represented by the ratio 3:2, and equal to three diatonic steps and a half. Such a fifth is called perfect or major; a fifth a half-step shorter is called diminished or minor; a fifth a half-step longer is called augmented, pluperfect, superfluous, or extreme. The perfect fifth is the next most perfect consonance after the octave. In harmony the parallel motion of two voices in perfect fifths is forbidden; such fifths are often called consecutive fifths, or simply consecutives.
7. n. In early English law, a fifth part of the rents of the year, or of movables, or both, granted or levied by way of tax.

Wiktionary

1. adj. The ordinal form of number five.
2. n. The person or thing in the fifth position.
3. n. One of five equal parts of a whole.
4. n. The fifth gear of an engine.
5. n. A quantity of liquor equal to one-fifth of a gallon, or, more commonly, 750 milliliters.
6. n. The musical interval between one note and another five tones higher.
7. n. The fifth voice in a polyphonic melody.

GNU Webster's 1913

1. adj. Next in order after the fourth; -- the ordinal of five.
2. adj. Consisting of one of five equal divisions of a thing.
3. n. The quotient of a unit divided by five; one of five equal parts; a fifth part.
4. n. (Mus.) The interval of three tones and a semitone, embracing five diatonic degrees of the scale; the dominant of any key.

WordNet 3.0

1. n. one part in five equal parts
2. n. a quantity of liquor equal to one fifth of a United States gallon
3. adj. coming next after the fourth and just before the sixth in position
4. n. position five in a countable series of things
5. n. the musical interval between one note and another five notes away from it