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illustrious

[ih-luhs-tree-uh s] /ɪˈlʌs tri əs/
adjective
1.
highly distinguished; renowned; famous:
an illustrious leader.
2.
glorious, as deeds or works:
many illustrious achievements.
3.
Obsolete. luminous; bright.
Origin
1560-1570
1560-70; < Latin illustri(s) bright, clear, famous (equivalent to illustr(āre) to brighten (see il-1, luster1) + -is adj. suffix) + -ous
Related forms
illustriously, adverb
illustriousness, noun
unillustrious, adjective
unillustriously, adverb
unillustriousness, noun
Synonyms
1. celebrated, eminent, famed.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for illustriousness

illustrious

/ɪˈlʌstrɪəs/
adjective
1.
of great renown; famous and distinguished
2.
glorious or great: illustrious deeds
3.
(obsolete) shining
Derived Forms
illustriously, adverb
illustriousness, noun
Word Origin
C16: from Latin illustris bright, distinguished, famous, from illustrāre to make light; see illustrate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for illustriousness

illustrious

adj.

1560s, from Latin illustris "lighted, bright, brilliant;" figuratively "distinguished, famous," probably a back-formation from illustrare "embellish, distinguish, make famous" (see illustration). Sometimes also illustrous. Replaced illustre in same sense (mid-15c.), from Middle French illustre.

Online Etymology Dictionary, © 2010 Douglas Harper
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