quid pro quo (kwĭd prō kwō)
n. pl. quid pro quos also quids pro quo
Something that is given in return for something else or accepted as a reciprocal part of an exchange.
[Latin quid prō quō : quid, something + prō, for + quō, ablative of quid, something.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.