Plural of commodatum; legal term for goods lent gratuitously (for free) with the expectation they will be returned in their original condition.
From Latin commodata, plural of commodatum (from commodare 'to lend'). A technical term from Roman law that remains in English legal systems.
Commodata is the legal term for when you lend your friend something expecting to get that exact same item back—it's different from a gift, which you don't expect to return, but the Romans needed precise language for this common situation.
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