A Latin phrase meaning “unwelcome person.” As a legal term, it refers to the practice of a state prohibiting a diplomat from entering the country as a diplomat, or censuring a diplomat already resident in the country for conduct unbecoming of the status of a diplomat. 

·         Protocol 

Refers to the ceremonial side of diplomacy, including matters of diplomatic courtesy and precedence. 

·         R  

Ratification 

To approve and sanction formally, as with a treaty. 

·         Recognition 

Commonly used in connection with the recognition by one state of the existence of another state (for example when a new one is formed), or the existence of a government which is in effective control of a state. 

·         S  

Sanctions