What does momentous mean?
Momentous is an adjective describing something of great importance, often an event, decision, or turning point whose consequences may be far-reaching. It is stronger and more ceremonial than ordinary words such as “important” and often implies that something will be remembered as a landmark in a person’s life or a community’s history. A reporter might describe a major agreement, political development, or personal decision as momentous, particularly when it changes the direction of events. The word is used in both British and American English but belongs mainly to formal registers, including journalism, historical accounts, and ceremonial speech. In less formal contexts, alternatives such as “important,” “significant,” or “pivotal” may sound more natural, depending on the degree of emphasis intended.
adjectiveOf great importance or significance, especially because of its potential consequences. The word often describes events or decisions that mark a major turning point.
- Of great importance or significance, especially because of its likely consequences.
"The signing of the agreement was a momentous occasion for both nations."
"The council reached a momentous decision to close the historic factory."
"It was a momentous day in her life when she accepted the position abroad."
A momentous event is not simply memorable—it changes the course of what follows.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does momentous come from?
Momentous was formed in the early 19th century from “moment,” which comes through Old French from the Latin “ momentum,” meaning a small movement or an instant of time. The suffix “-ous” was added to form an adjective expressing the idea of being important or consequential. Related forms include “moment” and “momentum,” both derived from the same Latin source.
How momentous is actually used
The word is formal and often conveys lasting historical importance. It is commonly used in journalism, historical writing, and formal speech rather than everyday conversation.
Easily confused with momentous
A moment is a brief point or period of time, whereas a momentous event or decision is one of major significance.