De Jure

DE JURE.    Rightfully; lawfully; by legal title. Contrasted with de facto, (which see.) 4 Bla. Com. 77
    Of right: distinguished with de gratia (by favor). By law: distinguished with de æquitate (by equity).
    The term is various applied; as, a king or officer de jure, or a wife de jure.
    A government de jure, but not de facto, is one deemed lawful, which has been supplanted; a government de jure and also de facto is one deemed lawful, which is present or established; a government de facto is one deemed unlawful, but which is present or established. Any established government, be it deemed lawful or not, is a government de facto. Austin, Jur. sec. vi. 336. See De Facto.
Bouvier’s Law Dictionary, Third Revision (8th Edition)(1914), Volume I, page 768.

de jure (dë jürë). By right, by lawful right; rightfully; complying with the law in all respects; valid in law.
Law Dictionary, James A. Ballentine, Second Edition, 1948, page 351.

De Jure. Of right; legitimate, lawful; by right and just title. In this sense contrary of de facto, (which see.) It may also be contrasted with de gratia, in which case it means “as a matter of right,” as de gratia means “by grace or favor.” Again it may be contrasted with de æquitate; here meaning “by law,” as the latter means “by equity.” See Government.
Black’s Law Dictionary 4th Edition (1951) page 481.

de jure (dë joor’e, dä-, di-) [[L]] by right or legal establishment [de jure government]: cf. de facto.
Webster’s New World Dictionary, 3rd College Ed. (1988), page 364.