De jure (in Classical Latin de iure) is an expression that means "concerning law", as contrasted with de facto, which means "concerning fact". The terms de jure and de facto are used instead of "in law" and "in practice", respectively, when one is describing political or legal situations.

In a legal context, de jure is also translated as "concerning law". A practice may exist de facto, where for example the people obey a contract as though there were a law enforcing it, yet there is no such law. A process known as "desuetude" may allow de facto practices to replace obsolete de jure laws. On the other hand, practices may exist de jure and not be obeyed or observed by the people.

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Juré - Examples
... In American law, particularly after Brown v ... Board of Education (1954), the difference between de facto segregation (segregation that existed because of the voluntary associations and neighborhoods) and de jure segregation (segregation that existed because of local laws that mandated the segregation), became important distinctions for court-mandated remedial purposes ...
... A de jure stateless person is someone who is "not considered as a national by any state under the operation of its law" ... A de facto stateless person is someone who is outside the country of his or her nationality and is unable or, for valid reasons, unwilling to avail him- or herself of the protection of that country ...