Definition from Wiktionary, the free dictionary
diplomacy (plural diplomacies)
- The art and practice of conducting international relations by negotiating alliances, treaties, agreements etc., bilaterally or multilaterally, between states and sometimes international organisms, or even between policies with varying status, such as those of monarchs and their princely vassals
- National diplomacy typically deploys its dexterity to secure advantage for one's nation.
- Tact and subtle skill in dealing with people so as to avoid or settle hostility.
Related terms 
art of conducting international relations
tact and subtle skill in dealing with people
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