What is the meaning of acme?

noun

• The highest level or degree attainable; the highest stage of development.
  • usage: "his landscapes were deemed the acme of beauty"; "the artist's gifts are at their acme"; "at the height of her career"; "the peak of perfection"; "summer was at its peak"; "... Catapulted Einstein to the pinnacle of fame"; "the summit of his ambition"; "so many highest superlatives achieved by man"; "at the top of his profession"
  • synonyms: height, elevation, peak, pinnacle, summit, superlative, meridian, tiptop, top
• The highest point (of something. )
  • usage: "at the peak of the pyramid"
  • synonyms: vertex, peak, apex