Something given in return for a item of equivalent value - like tit for tat.
A Latin term meaning 'something for something' or 'this for that'. The idea is more commonly expressed in English as 'one good turn deserves another'. This has been in the language since at least 1654, as here in H. L'Estrange's, 'The Reign of King Charles':
"One good turn deserves another."
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