Agreements or relationships where two or more people or groups work together toward a shared goal, with each contributing something valuable.
From Old French 'parçonier' meaning 'one who shares in portions.' The word evolved through Middle English by combining 'part' with the suffix '-ner' (one who does something), eventually becoming the modern term for cooperative arrangements.
The oldest partnerships weren't written contracts—they were handshake deals between medieval merchants who literally shared the risk of trading voyages, and breach of trust could end in exile from entire trading cities.
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