Gave something to someone and received something in return; traded or swapped.
From Old French 'eschangier,' combining 'ex-' (out) and 'change.' The word entered English during the Norman Conquest and originally meant a literal swap of goods or currency.
The concept of exchange is so fundamental that every civilization discovered it independently—even ancient peoples thousands of years apart traded objects. Money itself is just a more convenient way to exchange value than bartering chickens for grain.
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