Meaning of “first quarter” in the English Dictionary

"first quarter" in American English

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first quarternoun [ C ]

/ˈfɜrst ˈkwɔr·tər/

a half moon

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

"first quarter" in Business English

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first quarternoun [ C, usually singular ]

uk us

abbreviation Q1, US also fiscal first quarter ACCOUNTING, FINANCE the first three months in a company's financial year:

The company reported an excellent first quarter 2011.
Directors are scheduled to meet brokers today to discuss the firm's first-quarter performance.

the three months from January 1 to March 31:

The number of cars registered rose by 15% in the first quarter of this year.

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