Fourth

UK: /ˈfɔː^rθ/ US: /fɔrθ/ ,(fôrth, fōrth)

WordReference Random House Learner's Dictionary of American English © 2026

fourth /fɔrθ/   adj. 

1. next after the third;
   being the ordinal number for four.
2. being one of four equal parts.
3. Automotive relating to the gear transmission ratio at which the drive shaft speed is greater than that of third gear.

n. 

4. [countable] a fourth part, esp. of one (¼);
   quarter.
5. [countable] the fourth member of a series.
6. Automotive [uncountable] fourth gear.
7. the Fourth, Independence Day;
   the Fourth of July.

adv. 

8. in the fourth place.

fourth•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2026

fourth  (fôrth, fōrth), adj. 

1. next after the third;
   being the ordinal number for four.
2. being one of four equal parts.
3. Automotive of, pertaining 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.

n. 

4. a fourth part, esp. of one (¼).
5. the fourth member of a series.
6. Music and Dance
   • a tone on the fourth degree from a given tone (counted as the first).
   • the interval between such tones.
   • the harmonic combination of such tones.
7. Automotive fourth gear:
   She downshifted from fifth to fourth as we started up the hill.
8. (cap.) Independence Day;
   the Fourth of July (usually prec. by the).

adv. 

9. in the fourth place;
   fourthly.

• Middle English fourthe, Old English fēowertha. See four, -th² bef. 950

Collins Concise English Dictionary © HarperCollins Publishers::

fourth / fɔːθ/ adjective (usually prenominal)

1. coming after the third in order, position, time, etc. Often written: 4th
2. (as noun): the fourth in succession
3. denoting the fourth forward ratio of a gearbox in motor vehicles

noun

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 perfect9, interval5, diminished2
3. the fourth forward ratio of a gearbox in a motor vehicle
4. a less common word for quarter2

adverb
also: fourthly

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

sentence_connector
also: fourthly

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