cumulative
Concise Oxford English Dictionary © 2008 Oxford University Press:
cumulative/ˈkjuːmjələtɪv/
▶adjective increasing or increased in quantity or degree by successive additions: the cumulative effect of months of drought.
– derivatives
cumulatively adverb,
cumulativeness noun.
cumulatively adverb,
cumulativeness noun.
'cumulative' also found in these Oxford entries:

