mōˈmentəs also məˈ- adjective
Etymology: moment + -ous
1. : having moment : of moment or consequence : very important : weighty
on the eve of another momentous election — New York Times
the momentous character of the choice — M.R.Cohen
brought about the momentous changes that affect us all — W.S.Maugham
2. : having importance or influence — used of a person
made a momentous captive, an Indian … prisoner — Bernard DeVoto
• mo·men·tous·ly adverb