Meaning of “fourth” in the English Dictionary

"fourth" in American English

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fourthadjective, adverb, noun [ C ]

us /fɔrθ, foʊrθ/

(in the position of) the number 4 in a series; 4th:

Mark finished fourth in the race.
[ C ] My birthday is on the fourth of December.

A fourth is one of four equal parts of something.

(Definition of “fourth” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"fourth" in Business English

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fourthadjective [ before noun ]

uk /fɔːθ/ us

relating to the last three-month period of a company's financial year:

Manufacturing output fell 0.2% in the fourth quarter.
the company's fourth-period vehicle production plans

(Definition of “fourth” from the Cambridge Business English Dictionary © Cambridge University Press)