momentous

/məʊˈmɛn.təs/adjective

Extremely important, with major or lasting consequences.

Example sentence

“Signing the peace treaty was a momentous event in the nation's history.”

Reserved for genuinely historic occasions. Do not confuse with 'momentary', which means lasting only a moment.

Related words

momentumThe force that keeps a moving object moving, calculated as its mass multiplied by its speed.mollifyTo calm someone down or make their worry or anger less intense; to soothe.monitorA screen, similar to a television, that displays the output of a computer.moduleA separate part of a larger system that works on its own and connects to the other parts in a standard way.monotonousStaying at the same tone or pitch without variation, and therefore dull.modifyTo make partial changes to something.