agreement — An agreement is a formal decision about future action which is made by two or more countries, groups, or people.
accord — An accord between countries or groups of people is a formal agreement, for example to end a war.
arrangement — Arrangements are plans and preparations which you make so that something will happen or be possible.
deal — If you say that you need or have a great deal of or a good deal of a particular thing, you are emphasizing that you need or have a lot of it.
pact — an agreement, covenant, or compact: We made a pact not to argue any more.
settlement — the act or state of settling or the state of being settled.
treaty — a formal agreement between two or more states in reference to peace, alliance, commerce, or other international relations.
understanding — mental process of a person who comprehends; comprehension; personal interpretation: My understanding of the word does not agree with yours.