English
illustriousness
From illustrious + -ness.
A compound of illustrious + -ness
Old Latin *loustrom
Latin lūstrum ‘a purificatory sacrifice’
Latin lūstrō ‘to purify via sacrifice’
Latin illūstrō ‘to illuminate, brighten, light up’
Latin illūstris ‘bright, shining’
English illustrious
Today it means
noun The state of being illustrious.
Language periods are conventional ranges, not dates for this word.
Etymograph / illustriousness