noun

the highest or climactic point of something, especially as attained after a long time.

the deal marked the culmination of years of negotiation

climax,pinnacle,peak,high point,highest point,height,high water mark,top,summit,crest,zenith,crowning moment,apotheosis,apex,apogee,vertex,finale,denouement,consummation,completion,finish,conclusion,close,termination,high noon