ascent (noun) (usually sing) the act of climbing or moving up. An upward journey the first ascent of mount Everest the cart began its gradual ascent up the hill. The rocket steepened its ascent. Opp descent 2. (usually sing) an upward path or slope At the other side of the valley was a sleep ascent to the top of the hill. Opp descent 3. (formal) the process of moving forward to a better position or of making progress. Man’s ascent to civilization.