momentous
Americanadjective
adjective
Synonym Usage
See heavy.
Other Word Forms
Etymology
Origin of momentous
Explanation
Momentous describes an important event or moment in time. It is used for a time of great consequence or for a major accomplishment, and is almost always reserved for good things. When a moment is so great you know you'll never forget it, you have just experienced something momentous. It can be personal — perhaps the day you were named prom queen; or something historic — like the day Elizabeth was named Queen of England. Momentous and momentary share the root word moment but momentary describes just one fleeting moment in time. A momentary occurrence can certainly be momentous, but it's not always the case.
Vocabulary lists containing momentous
The SAT: Words to Capture Tone, List 3
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The New SAT: Words to Capture Tone
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100 SAT Words Beginning with "M"
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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.
Probiotics maker Pendulum Therapeutics paid her $27,000 to sponsor her newsletter, and supplement company Momentous paid her nearly $40,000.
From The Wall Street Journal • Oct. 30, 2025
In June 2022, it debuted its Momentous multimedia and fireworks show, which is staged at its castle on most nights.
From Seattle Times • Nov. 20, 2023
Momentous things happened in the “And Just Like That …” Season 2 finale: Carrie took off her bra.
From New York Times • Aug. 24, 2023
Momentous days also become known largely in hindsight.
From Salon • Jun. 19, 2022
Momentous silence followed this announcement, while the habitues of the Thieves’ Tavern glanced into each others’ faces in consternation.
From Dangerous Ground or, The Rival Detectives by Lynch, Lawrence L.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
