Use the noun consummation when you mean the point at which something is finalized or completed. Your graduation from college will be the consummation of four years of hard work.
Consummation comes from the Latin verb consummare, which means to sum up or to finish. The moment when something is finished is its consummation. The consummation of a year's hard work might be when you use your earnings to finally achieve your dream of traveling to Africa. The noun consummation can also refer specifically to the first act of sexual intercourse after a marriage.