Meaning of “momentous” in the English Dictionary

"momentous" in British English

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momentousadjective

uk /məˈmen.təs/ us /məˈmen.t̬əs/
momentously
adverb uk /məˈmen.təs.li/ us /məˈmen.t̬əs.li/
momentousness
noun [ U ] uk /məˈmen.təs.nəs/ us /məˈmen.t̬əs.nəs/

(Definition of “momentous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"momentous" in American English

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momentousadjective

us /moʊˈmen·təs/

very important, esp. because of the effects on future events:

a momentous decision/event

(Definition of “momentous” from the Cambridge Academic Content Dictionary © Cambridge University Press)