acme in WordNet English dictionary

1. the highest point (of something)
   "at the peak of the pyramid"
   vertex  peak  apex  acme 
   
2. the highest level or degree attainable; the highest stage of development
   "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"
   acme  height  elevation  peak  pinnacle  summit  superlative  meridian  tiptop  top