Something which is understood as something else; an equivocation.
An equal or fair transaction or series of process of exchange transactions; tit for tat.
Something which is offered or asked for in exchange for something else.
Substitution of one drug for another.
A usually non-monetary exchange transaction, or series or process of exchange transactions.
Sexual harassment in which a person in a workplace implicitly or explicitly requires sexual favours in exchange for something.
A transposition.
a musical instrument that is written in a different pitch to how it sounds, often for ease of playing multiple instruments of the same family that have different ranges.