The word for today is…
quid pro quo (noun) – Something that is given in return for something else or accepted as a reciprocal part of an exchange.
Source : The Free Dictionary
Etymology : 1560s, from Latin, literally “something for something, one thing for another,” from nominative and ablative neuter singulars of relative pronoun qui “who” (from PIE root *kwo-, stem of relative and interrogative pronouns) + pro “for” + quo, ablative of quid.
