de jure UK /deɪ ˈd͡ʒʊəɹeɪ/US /deɪ ˈd͡ʒʊɹi/adjective 1adverb 1 adjective1 •Legal; justified by right or by law, especially when in name only. adverb1 •By right; in accordance with or as deemed by the statute of the law, particularly as opposed to actual practice.I used to spend my Sundays playing pinball despite it being de jure illegal under an unenforced bylaw.