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English definition of “Apex”

Apex

noun [C] (also APEX)     /ˈeɪpeks/
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 noun from the Cambridge Business English Dictionary © Cambridge University Press)
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