The name for letters given to an ambassador by his/her chief of state, and addressed to the chief of state of the host country. They are delivered to the latter by the ambassador in a formal credentials ceremony, which generally takes place shortly after his/her arrival at a new post. Until this ceremony has taken place s/he is not formally recognized by the host country and cannot officially act as an ambassador. The letters are termed "letters of credence" because they request the receiving chief of state to give "full credence" to what the ambassador will say of behalf of his/her government. 

·         D  

Defection 

When an official gives up his or her allegiance to one state in preference for another, usually because of disagreement over government policy, often immigrating to or seeking asylum in the new state. Defecting generally indicates a desire to participate in opposition or political activity that is illegal or impossible in the original country, differentiating it from a simple change in citizenship. 

·         Department of State 

The oldest and head agency in the President’s cabinet. The Secretary of State leads the Department of State in carrying out the President's foreign policies. The Department was initially founded as the Department of Foreign Affairs in 1781 and then renamed in 1789 in the Constitution as the Department of State. 

·         Diplomacy 

The art and practice of conducting negotiations and maintaining relations between nations; skill in handling affairs without arousing hostility. 

·         Diplomat