fourth

American  

[fawrth, fohrth] / fɔrθ, foʊrθ /

adjective

1. next after the third; being the ordinal number for four.

2. being one of four equal parts.

3. Automotive. of, relating to, or operating at the gear transmission ratio at which the drive shaft speed is greater than that of third gear for a given engine crankshaft speed, but not so great as that of fifth gear, if such exists.

   fourth gear.

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noun

fourths plural

1. a fourth part, especially of one (¼).

2. the fourth member of a series.

3. Music.

   1. a tone on the fourth degree from a given tone (counted as the first).

   2. the interval between such tones.

   3. the harmonic combination of such tones.

4. Automotive. fourth gear.

   She downshifted from fifth to fourth as we started up the hill.

5. the Fourth. Independence Day; the Fourth of July.

adverb

1. in the fourth place; fourthly.

fourth British  

/ fɔːθ /

adjective

1. 1. coming after the third in order, position, time, etc. Often written: 4th

   2. ( as noun )

      the fourth in succession

2. denoting the fourth forward ratio of a gearbox in motor vehicles

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noun

1. music

   1. the interval between one note and another four notes away from it counting inclusively along the diatonic scale

   2. one of two notes constituting such an interval in relation to the other See also perfect interval diminished

2. the fourth forward ratio of a gearbox in a motor vehicle

   he changed into fourth as soon as he had passed me

3. a less common word for quarter

adverb

1. after the third person, position, event, etc

1. as the fourth point: linking what follows with the previous statements, as in a speech or argument

Other Word Forms

Noun Inflected Forms

• fourths
  plural

Etymology

Origin of fourth

First recorded before 950; Middle English fourthe, Old English fēowertha; see four, -th ²

Example Sentences

Gary Nolan was speaking as family, friends and well-wishers gathered to pay tribute to Preston on what would have been his fourth birthday.

From BBC • Jun. 16, 2026

The bank lowered its oil-price forecast and now expects Brent crude to average $85 a barrel in the fourth quarter, down from its previous forecast of $90 a barrel.

From The Wall Street Journal • Jun. 16, 2026

Plum fouled out midway through the fourth quarter after being held to four points in the third quarter.

From Los Angeles Times • Jun. 16, 2026

It will add the company’s proprietary AI model and agent to its portfolio and the transaction is expected to close in the fiscal 2027 fourth quarter.

From Barron's • Jun. 15, 2026

Someone exited on the fourth floor, so Coal had to squeeze himself against the cold wall as they passed.

From "Boy 2.0" by Tracey Baptiste

Related Words

• one-fourth
• part
• portion
• term