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English word grandeur comes from French -eur, Proto-Indo-European *ghrewə-, French grand, and later Old French grant (Big, large.)
-eur (French)
Used to form abstract nouns from adjectives; -ness.. Used to form agent nouns from verbs.
*ghrewə- (Proto-Indo-European)
grand (French)
(usually, capitalized) Great, an honorific title. Big, great, grand. Extensive, large. Great; big fat; an intensifier. Tall.
grandiorem (Latin)
grant (Old French)
Big, large.
grandur (Old French)
Largeness; bigness.
grandeur (Middle French)
grandeur (English)
(archaic, rare) Greatness; largeness; tallness; loftiness.. Nobility.. The state of being grand or splendid; magnificence.