noun
1.
Synonyms: top 1, crest, crown, fastigium, peak, roof, summit, vertex
Related Word: extremity, limit, spire
Antonyms: nadir
2.
the culminating point
the apex of his career
Synonyms: acme, apogee, capsheaf, capstone, climax, comble, crescendo, crest, crown, culmen, culmination, meridian, ne plus ultra, noon, noontide, peak, pinnacle, sublimity, summit, zenith
Related Word: last word, prime, quintescence, ultimate; achievement, attainment, consummation, realization
Antonyms: nadir
3.
Synonyms: point 9, cusp, tip
Related Word: cap, crest, peak, prominence, spire