ac ‧ cu ‧ mu ‧ la ‧ tive /əˈkjuːmjələtɪv, əˈkjuːmjʊlətɪv $ -leɪ-, -lə-/ BrE AmE adjective
[ Word Family: verb : ↑ accumulate ; noun : ↑ accumulation ; adverb : ↑ accumulatively ; adjective : ↑ accumulative ]
gradually increasing in amount or degree over a period of time SYN cumulative
—accumulatively adverb