Bing found the following results
Cumulate Definition & Meaning - Merriam-Webster
CUMULATE | English meaning - Cambridge Dictionary
On ‘Culminate’ and ‘Cumulate’ - Merriam-Webster
CUMULATE | definition in the Cambridge English Dictionary
Accumulate Definition & Meaning - Merriam-Webster
CUMULATE Definition & Meaning | Dictionary.com
Cumulate - Definition, Meaning & Synonyms | Vocabulary.com
CUMULATE definition and meaning | Collins English Dictionary
Cumulate - definition of cumulate by The Free Dictionary
cumulate - Wiktionary, the free dictionary
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