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momentous

mo·men·tous

momentous

 
pronunciation:
mo men ts
part of speech: adjective
definition: of very great significance or importance.
The assassination of Martin Luther King was a momentous event in US history.
synonyms:
critical, crucial, eventful, fateful, grave, major, pivotal, significant
antonyms:
insignificant, petty, trivial
similar words:
big, climacteric, earthshaking, fatal, great, important, serious, special, vital, weighty
derivations: momentously (adv.), momentousness (n.)