Meaning of “apex” in the English Dictionary

"apex" in English

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apexnoun [ C ]

uk /ˈeɪ.peks/ us /ˈeɪ.peks/ plural apexes or apices uk /ˈeɪ.pɪ.siːz/ us

Apexnoun [ U ], adjective [ before noun ]

uk /ˈeɪ.peks/ us /ˈeɪ.peks/

(Definition of “apex” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"apex" in American English

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apexnoun [ C usually sing ]

us /ˈeɪ·peks/

the highest point or top of something:

the apex of a pyramid
He reached the apex of his career during that period.

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

"Apex" in Business English

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Apexnoun [ C ]

also APEX uk /ˈeɪpeks/ us

TRANSPORT a train or plane ticket that is cheaper than the usual price because you buy it several days or weeks before you travel:

First Great Western's cheapest fare, an Apex, must be booked at least a week before travel.
an Apex ticket/fare

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