zenithEnglishOxford American Thesauruszenith noun the king was at the zenith of his power: highest point, high point, crowning point, height, top, acme, peak, pinnacle, apex, apogee, vertex, tip, crown, crest, summit, climax, culmination, maximum, optimum, prime, meridian, flower; informal high noon. ▷antonyms nadir, bottom.
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