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illustrious (adj.)

1560s, "distinguished by greatness, renowned," from Latin illustris "lighted, bright, brilliant;" figuratively "distinguished, famous," probably a back-formation from illustrare "make light, light up, illuminate," figuratively "embellish, distinguish, make famous" (see illustration). Replaced illustre in same sense (mid-15c.), from French illustre.

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Definitions of illustrious from WordNet

illustrious (adj.)
widely known and esteemed;
an illustrious judge
Synonyms: celebrated / famed / far-famed / famous / notable / noted / renowned
illustrious (adj.)
having or conferring glory;
an illustrious achievement
From wordnet.princeton.edu