[adj] Renowned or most famous person or thing. Highly distinguished. Great, as in actions and deeds.
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Memorable, famous. Well-known or notable.
My father was a crew member on the most illustrious ship of the navy during World War II.
In a Quote
"She came from Wales; and had had, a long time ago, an eminent person for an ancestor, of the name of Morgan ap-Kerrig — of some place that sounded like Gimlet — who was the most illustrious person that ever was known..." Charles Dickens, Bleak House.

