[ moh-men-tuhs ]
/ moʊˈmɛn təs /


of great or far-reaching importance or consequence: a momentous day.


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Origin of momentous

First recorded in 1645–55; moment + -ous

OTHER WORDS FROM momentous Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for momentous

British Dictionary definitions for momentous

/ (məʊˈmɛntəs) /


of great significance

Derived forms of momentous

momentously, adverbmomentousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012