Negotiate

To negotiate refers to a situation where there is an argument between two companies or two individuals and they typically try to resolve their differences by arriving at a compromise.

Additional Sources

Answers.com

To confer with another or others in order to come to terms or reach an agreement.

Duhaime Legal Dictionary

To communicate on a matter of disagreement between two parties, with a view to first listen to the other party's perspective and to then attempt to arrive at a resolution by consensus.

FindLaw

To confer with another so as to settle some matter.

The Free (Legal) Dictionary

To conduct business transactions; to deal with another individual in regard to a purchase and sale; to bargain or trade. To conclude by way of agreement, bargain, or compact. To transfer a negotiable instrument, such as a promissory note, or other Commercial Paper.

Wikipedia

Negotiation is a dialogue intended to resolve disputes, to produce an agreement upon courses of action, to bargain for individual or collective advantage, or to craft outcomes to satisfy various interests. It is the primary method of alternative dispute resolution.

Negotiation occurs in business, non-profit organizations, government branches, legal proceedings, among nations and in personal situations such as marriage, divorce, parenting, and everyday life. The study of the subject is called negotiation theory. Professional negotiators are often specialized, such as union negotiators, leverage buyout negotiators, peace negotiators, hostage negotiators, or may work under other titles, such as diplomats, legislators or brokers.