apex

(noun): Conical priest cap
(noun): The highest or the greatest point of something.
(noun): The moment of greatest success, expansion, etc.
(noun): The topmost vertex of a cone or pyramid (in their conventional orientation).
(noun): The "pointed" fine end of something.
(noun): The end of a leaf, petal or similar organ opposed to the end where it is attached to its support; the tip.
(noun): The point on the celestial sphere toward which the sun appears to move relative to nearby stars.
(noun): The lowest point on a pendant drop of a liquid.
(noun): The end or edge of a vein nearest the surface.
(noun): A diacritic in Classical Latin that resembles and gave rise to the acute.
(noun): A diacritic in Middle Vietnamese that indicates /ŋ͡m/.
(noun): 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".
(noun): The top of the food chain