Etymology

momentous

M3O1M3E1N1T1O1U1S1

Today it means: Outstanding in importance, of great consequence. Full definition →

Proto-Indo-European *h₃édosder.? ← English moment
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The story

  1. Englishmoment
  2. Proto-Indo-European*h₃ed-
  3. Proto-Indo-European*h₃édosder.?
  4. English todaymomentous

From moment (“weight, importance”) + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.