Etymology
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momentous (adj.)

"of moment or consequence, critical, of surpassing importance," 1650s, from moment + -ous to carry the sense of "important" while momentary kept the meaning "of an instant of time." Related: Momentously; momentousness.

updated on February 13, 2019

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Definitions of momentous from WordNet

momentous (adj.)
of very great significance;
a momentous event
From wordnet.princeton.edu, not affiliated with etymonline.