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momentous

adjective

  1. having great or lasting importance: consequential, significant
L228059 on Wikidata ↗

Wiktionary

Pronunciation: /məʊˈmɛn.təs/ / /moʊˈmɛn.təs/

adj

Etymology: Etymology tree English moment Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ōtsos or *-otsos Latin -ōsus Old French -usbor. Middle English -ous English -ous English momentous From moment (“weight, importance”) + -ous.

  1. Outstanding in importance, of great consequence.

    The reason why I did not publish this book till the end of the last sessions of parliament was, because I did not care to interfere with more momentous affairs.

    "It has been a momentous month, and I hope we shall all retain healthful recollections of it as long as we live."