negotiation

The Latin word otium meant leisure, ease, the cultivated absence of obligation. Cicero wrote about it in his letters as the proper condition for a thinking man. Negotium was its opposite: nec (not) plus otium, literally 'not-leisure.' Business, trade, the grinding work of the forum, was simply what you did when you were not at ease. Cato the Elder used negotium repeatedly in the 2nd century BCE to mean any serious task demanding effort.

The derivative negotiari meant to carry on business or trade, and by extension to deal and to transact. The noun negotiatio designated commerce itself, and a negotiator was a Roman financier who arranged transactions. Cicero and Caesar both used these forms in their writings. The concept was entirely commercial in classical Latin: there was no sense of compromise or dialogue, only the straightforward fact of doing business.

Medieval Latin stretched the root. Church documents from the 12th century used negotiatio for dealings between parties, not just trade. French adopted the word as négociation by the 15th century. By the time it entered English in the 1520s, it already carried the sense of treating with another party to reach agreement. The first recorded English use appears in correspondence related to diplomatic dealings between Henry VIII and the French court.

The modern sense locked in during the 16th and 17th centuries, when European diplomacy needed vocabulary for formal dealings between sovereign states. The Peace of Westphalia in 1648, which ended the Thirty Years' War, was the product of negotiations in the modern sense: protracted, structured, full of concessions and bad faith. The word that started as the mere absence of leisure became the name for the architecture of how nations avoid war.