quid pro quo

Something which is understood as something else; an equivocation.

Substitution of one drug for another.

Something which is offered or asked for in exchange for something else.

A usually non-monetary exchange transaction, or series or process of exchange transactions.

An equal or fair transaction or series of process of exchange transactions; tit for tat.

Sexual harassment in which a person in a workplace implicitly or explicitly requires sexual favours in exchange for something.