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momentous

mo·men·tous

momentous

 
pronunciation:
mo men ts
part of speech: adjective
definition: very important.
The Battle of Hastings was a momentous event in British history.
synonyms:
critical, crucial, grave, major
antonyms:
insignificant, petty, trivial
similar words:
big, important, serious, vital
derivations: momentously (adv.), momentousness (n.)