(geometry) The highest point in a plane or solid figure, relative to a base line or plane. / (chiefly anatomy) The pointed fine end of something.

plural of apex

(aviation) Acronym of advance purchase excursion (an air fare)

(Britain, trade union) Acronym of Association of Professional, Executive, Clerical and Computer Staff.

Having an apex; with a pointed end.

plural of apex fallacy

The informal fallacy of evaluating a population based only on its apex, its best members.

An animal atop the food chain, preying but not prey.

(astronomy) The point to which the Sun appears to be moving with respect to the local stars

plural of apex predator