Englishacme
noun
she was at the acme of her power:
peak, pinnacle, zenith, highest point, high point, crown, crest, summit, top, tip, apex, apogee;
climax, culmination, height, maximum, optimum, extremity, limit, upper limit, crowning point, prime, flower, flowering, bloom, blooming, highlight;
informal high noon.
▷antonyms nadir, bottom, lowest point.