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Quid pro quo (Latin for "something for something") indicates a more-or-less equal exchange or substitution of goods or services. English speakers often use the term to mean, "a favour for a favour," and the phrases, "what for what" and "tit for tat" have similar meanings. In Portuguese, French and Italian, it means a misunderstanding: taking one thing to mean or be another. In those languages, the (Latin) phrase corresponding to the English usage is do ut des (Latin for "I give, so that you give").
In legal usage, "Quid pro quo" indicates that an item or a favour has been traded in return for something of value, usually when the propriety or equity of the transaction is in question. For example, under the common law, a binding contract must involve consideration: that is, the exchange of something of value for something of similar value. If the exchange appears excessively one sided, the court may question whether a quid pro quo exists and the contract may be voidable.
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M$1. (italics) Latin. one thing in return for another.
2. something that is given or taken in return for something else; substitute.
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