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momentous

adjective
 
 
/məˈmen.təs/ US  /-t̬əs/

Definition

very important because of effects on future events: the momentous news of the president's death Whether or not to move overseas was a momentous decision for the family.Very important or urgent momentously
 
 
/-li/ adverb
Very important or urgent
momentousness
 
 
/-nəs/ noun [U]
ImportanceUseful or advantageous
(Definition of momentous adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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