fifth
Americanadjective
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next after the fourth; being the ordinal number for five.
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being one of five equal parts.
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Automotive. of, relating to, or operating at the gear transmission ratio at which the drive shaft speed is greater than that of fourth gear for a given engine crankshaft speed.
fifth gear.
adverb
noun
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a fifth part, especially of one (1/5).
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the fifth member of a series.
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a fifth part of a gallon of liquor or spirits; 4/5 (0.8) of a quart (about 750 milliliters).
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Automotive. fifth gear.
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Music.
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a tone on the fifth degree from another tone (counted as the first).
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the interval between such tones.
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the harmonic combination of such tones.
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idioms
adjective
noun
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one of five equal or nearly equal parts of an object, quantity, measurement, etc
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( as modifier )
a fifth part
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the fraction equal to one divided by five ( 1/ 5 )
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music
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the interval between one note and another five notes away from it counting inclusively along the diatonic scale
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one of two notes constituting such an interval in relation to the other See also perfect diminished interval
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an additional high gear fitted to some motor vehicles
adverb
Etymology
Origin of fifth
First recorded before 1000; earlier fift, Middle English fifte, Old English fīfta; -th by analogy with fourth, etc.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Pacific Valley said it could use Taylor Fresh Foods’ capital injection to pay down debt, build a fifth branch or even acquire another bank down the road.
He gamely saved four set points at 3-5 but with his energy levels dropping was unable to save a fifth as the Spaniard took control.
From Barron's
Two-time Australia champion Sabalenka had her chances, notably leading the final set 3-0, but the fifth seed retained her trademark cool to pull through.
From Barron's
Merchandise exports still fell for a fifth consecutive month in December 2025, and while inflation slightly eased, it continues to erode what people can afford.
From Barron's
Indiana is tied for fifth with five, the last coming in 1987 under Bob Knight.
From Los Angeles Times
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.