Synonyms

momentous

American

[moh-men-tuhs] / moʊˈmɛn təs /

adjective

of great or far-reaching importance or consequence.

a momentous day.

Synonyms:

serious, crucial, critical, vital

Antonyms:

trifling, trivial

momentous British

/ məʊˈmɛntəs /

adjective

of great significance

"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

Related Words

See heavy.

Other Word Forms

momentously adverb
momentousness noun
unmomentous adjective
unmomentously adverb
unmomentousness noun

Etymology

Origin of momentous

First recorded in 1645–55; moment + -ous

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Humanists UK chief executive Andrew Copson said it was a "momentous vote of confidence for compassion, dignity, and choice at the end of life".

From BBC

Upon his reaching 70, Michael Tilson Thomas made a momentous meal of “Missa Solemnis” 11 years ago with a staged performance with the Los Angeles Philharmonic at Walt Disney Concert Hall.

From Los Angeles Times

These momentous moves speak to investors’ lofty expectations heading into Friday’s announcement.

From Barron's

The Milano Ice Skating Arena has been the scene of momentous slip-ups for skaters in other contests after they competed in the team event earlier in the Milan-Cortina Games.

From Barron's

When considered as a percentage of GDP, the projected 2026 spending of four tech giants rivals the most momentous capital efforts in U.S. history.

From The Wall Street Journal

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023