APEX

== English == === Etymology 1 === ==== Alternative forms ==== (aviation): Apex ==== Noun ==== APEX (aviation) Acronym of advance purchase excursion (an air fare). (medicine, nephrology) Acronym of accelerated peritoneal equilibration examination. (organic chemistry) Acronym of acetone peroxide. ===== Derived terms ===== APEX time === Etymology 2 === ==== Proper noun ==== APEX (British, trade union) Acronym of Association of Professional, Executive, Clerical and Computer Staff.