apex

noun

• Conical priest cap
• The highest or the greatest point of something.

  "the apex of the building"

• The moment of greatest success, expansion, etc.

  "the apex of civilization"

• The topmost vertex of a cone or pyramid (in their conventional orientation).
• The "pointed" fine end of something.
• The end of a leaf, petal or similar organ opposed to the end where it is attached to its support; the tip.
• The point on the celestial sphere toward which the sun appears to move relative to nearby stars.
• The lowest point on a pendant drop of a liquid.
• The end or edge of a vein nearest the surface.
• 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".
• The top of the food chain