1. The reaching of agreement through discussions and compromises.
2. The tackling of a hazard or problem.
3. Discussion sessions or one or more meetings at which attempts are made to reach an agreement through discussion and compromise.
4. The mutual discussion and arrangement of the terms of a transaction or agreement.
5. Etymology: from Latin negotiationem, negotiatio, "business, traffic"; from Latin negotiatus, negotiari, "to carry on business"; from negotium, "business"; literally, "lack of leisure"; from neg-, "not" + otium, "ease, leisure".

The shift from "doing business" to "bargaining" about anything took place in Latin.