Pronunciation: (ā'peks),[key] —n., —pl.a•pex•es, a•pi•cesPronunciation: (ā'pu-sēz", ap'u-).[key] 1. the tip, point, or vertex; summit.
2. climax; peak; acme: His election to the presidency was the apex of his career. 3. Astron.See solar apex.
Pronunciation: (ā'peks),[key] a type of international air fare offering reduced rates for extended stays that are booked in advance. [1970–75; A(dvance) P(urchase) Ex(cursion)]