A person who practices diplomacy or who is skilled in negotiating between countries or groups, similar to a diplomat.
From 'diplomacy' + '-ist' (one who practices). An older term that was gradually replaced by 'diplomat' in modern usage. Used primarily in the 18th and 19th centuries to describe professional negotiators.
A 'diplomatist' is basically just an old-fashioned word for a diplomat—but it's fun to say and reveals how language changes: we dropped the extra syllables because English speakers like shorter words!
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