diplomat
US /ˈdɪp.lə.mæt/
UK /ˈdɪp.lə.mæt/

1.
an official representing a country abroad
:
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The diplomat presented his credentials to the foreign minister.
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She dreams of becoming a diplomat and working for peace.
2.
a person who is skilled in dealing with people in a sensitive and effective way
:
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He's a real diplomat when it comes to handling difficult customers.
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You need to be a bit of a diplomat to mediate this dispute.