Cumulate is a verb that means to ACCUMULATE or gather over time. The crossword solutions for this term are ACCUMULATE (10 letters), GARNER (6 letters), and MERGE (5 letters). ACCUMULATE means to gather or collect gradually, while GARNER means to acquire or obtain something, and MERGE means to combine or unite two or more things. All three words can be used to describe the process of cumulating, which is the gradual gathering or collecting of something over time.