δίπλωμα

Greek δίπλωμα (díplōma) comes from diplóos (double, folded), from dís (twice) + -plóos (fold). A diploma was a document folded in two — an official letter, a state paper, a travel pass. Roman diplomas were bronze tablets (folded pairs) granting rights to soldiers. The word entered Latin as diploma (an official document) and French as diplomatique before English adopted 'diplomacy' in the eighteenth century. Edmund Burke used the word in 1796. The art of international relations was named for its paperwork.

The Congress of Vienna (1815) established modern diplomacy as a professional practice. Before Vienna, diplomatic relationships between states were ad hoc — ambassadors were sent for specific missions and recalled. After Vienna, permanent embassies, professional diplomats, and diplomatic protocol became standard. The word 'diplomacy' named this new permanent system of international negotiation.

The word acquired a second meaning: tact, the ability to handle sensitive situations without causing offense. 'That requires diplomacy' means 'that requires not saying what you think.' This figurative meaning emerged in the nineteenth century and has become at least as common as the political one. A diplomatic person is not necessarily a diplomat — they are someone who folds their message carefully before delivering it. The folded document became a folded truth.

Diplomatic immunity — the legal protection of diplomats from prosecution in host countries — is codified in the Vienna Convention on Diplomatic Relations (1961). The practice is older: heralds and ambassadors have been considered inviolable since ancient times. The word 'diplomacy' carries this protection: diplomats are shielded, their documents are sealed, their conversations are confidential. The art of the folded paper requires that some things stay folded.