Fourth - definition of fourth by The Free Dictionary 1 a coming after the third in order, position, time, etc Often written: 4th b (as noun): the fourth in succession 2 (Automotive Engineering) denoting the fourth forward ratio of a gearbox in motor vehicles
Forth vs. Fourth: Whats the Difference? - Grammarly Understanding the difference between forth and fourth is key to proper English usage Forth is an adverb meaning 'forward in time, place, or order,' while fourth describes the ordinal number following third