- Aide-mémoire
- A written summary handed across a desk so that nobody pretends, later, to have misheard.
- Bonne Office
- A friendly state offering its drawing room when two enemies refuse to share a city.
- Casus Belli
- The provocation one chooses to notice. Often the smallest in a long ledger.
- Démarche
- A formal complaint delivered politely. The politeness is the message.
- Entente
- An understanding that prefers, where possible, not to be written down.
- Fait Accompli
- What one side has finished doing while the other was still drafting its response.
- Modus Vivendi
- An arrangement allowing two sides to disagree quietly enough to keep trading.
- Persona Non Grata
- An envoy invited to leave by the morning train. Cause need not be given.
- Quid Pro Quo
- The grammar of exchange. Diplomacy without it is mere correspondence.
- Rapprochement
- The slow, deliberate walk of two states toward a shared photograph.