Noun
1. the highest level or degree attainable;
"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"2. the highest point (of something);
"at the peak of the pyramid"