Definition of illustrious adjective from the Oxford Advanced Learner's Dictionary

 

illustrious

 adjective
adjective
BrE BrE//ɪˈlʌstriəs//
 
; NAmE NAmE//ɪˈlʌstriəs//
 
(formal)
 
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very famous and much admired, especially because of what you have achieved synonym distinguished The composer was one of many illustrious visitors to the town. a long and illustrious career Word Origin mid 16th cent.: from Latin illustris ‘clear, bright’ + -ous.
See the Oxford Advanced American Dictionary entry: illustrious