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 principle" 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 laws. On the other hand, practices may exist de jure and not be obeyed or observed by the people.
As a logical complement of "de facto", where "de facto" has a more generic acceptance (not so restrictive as at legal context), like in social sciences. See de facto standards and other usages.
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