cumulate
verb
cu·mu·late ˈkyü-myə-ˌlāt 
cumulated; cumulating
transitive verb
1
: to gather or pile in a heap
2
: to combine into one
3
: to build up by addition of new material
intransitive verb
: to become massed
cumulate
ˈkyü-myə-lət -ˌlāt
adjective -ˌlāt cumulation
ˌkyü-myə-ˈlā-shən
noun 
Did you know?
Cumulate and its far more common relative accumulate both come from the Latin word cumulare, meaning "to heap up." Cumulare, in turn, comes from cumulus, meaning "mass." (Cumulus functions as an English word in its own right as well. It can mean "heap" or "accumulation," or it can refer to a kind of dense puffy cloud with a flat base and rounded outlines.) Cumulate and accumulate overlap in meaning, but you're likely to find cumulate mostly in technical contexts. The word's related adjective, cumulative, however, is used more widely.
Example Sentences
Recent Examples on the Web The two women met by chance in 2017 and their partnership has cumulated into these three political pieces. 
Marina Liao, Marie Claire, 14 June 2018
Marina Liao, Marie Claire, 14 June 2018 Word History
Etymology
Latin cumulatus, past participle of cumulare, from cumulus mass
First Known Use
1534, in the meaning defined at transitive sense 1