ILLUSTRIOUS Meaning of ILLUSTRIOUS in English [ ɪ'lʌstrɪəs ]■ adjective well known and highly respected.Derivatives~ly adverb~ness noun OriginC16: from L. illustris 'clear, bright' + -ous . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004