apex

IPA: ˈeɪpɛks

The highest or the greatest part of something, especially forming a point.
(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.
The lowest part of the human heart.
The deepest part of a tooth's root.
(botany) The end of a leaf, petal or similar organ opposed to the end where it is attached to its support.
(botany) The growing point of a shoot.
(astronomy) The point on the celestial sphere toward which the Sun appears to move relative to nearby stars.
(physics) The lowest point on a pendant drop of a liquid.
(mining, US) The end or edge of a vein nearest the surface.
(typography):
A diacritic in Classical Latin that resembles and gave rise to the acute.
A diacritic in Middle Vietnamese that indicates /ŋ͡m/.
A sharp upward point formed by two strokes that meet at an acute angle, as in "W", uppercase "A", and closed-top "4", or by a tapered stroke, as in lowercase "t".
(figuratively) The moment of greatest success, expansion, etc.
(attributive, ecology) The top of the food chain.
A conical priest cap.
(aviation) Acronym of advance purchase excursion (an air fare)
(Britain, trade union) Acronym of Association of Professional, Executive, Clerical and Computer Staff.

Examples of "apex" in Sentences

The climber finally reached the apex of the mountain after hours of strenuous hiking
His performance at the competition reached the apex of perfection, earning him first place
The apex predator in this ecosystem is the mighty lion, feared by all other animals
The company's success reached its apex when they secured a lucrative deal with a major corporation
At the apex of her career, she was the most sought-after actress in Hollywood, with roles in multiple blockbuster films