Middle English eschaungen < Anglo-French eschaungier < Vulgar Latin *excambiāre; late 15c., from Old French eschangier "exchange, barter," from Vulgar Latin *excambiare n. (noun) Middle English eschaunge < Anglo-French (Old French eschange), derivative of eschaungier; late 14c., "act of reciprocal giving and receiving," from Anglo-French eschaunge, Old French eschange (Modern French échange), from Late Latin excambium, from excambiare, from Latin ex-"out" + cambire "barter".Practice of merchants or lenders meeting to exchange bills of debt led to meaning "building for mercantile business" (1580s).
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