Gresham Land Use & Zoning Lawyer, Oregon, page 10

A meeting of the minds. An agreement is made when two people reach an understanding about a particular issue, including their obligations, duties and rights. While agreement is sometimes used to mean contract -- a legally binding oral or written agreement -- it is actually a broader term, including understandings that might not rise to the level of a legally binding contract.

(1) A written agreement purchased from a bonding company that guarantees a person will properly carry out a specific act, such as managing funds, showing up in court, providing good title to a piece of real estate or completing a construction project. If the person who purchased the bond fails at his or her task, the bonding company will pay the aggrieved party an amount up to the value of the bond. (2) An interest-bearing document issued by a government or company as evidence of a debt. A bond provides pre-determined payments at a set date to the bond holder. Bonds may be 'registered' bonds, which provide payment to the bond holder whose name is recorded with the issuer and appears on the bond certificate, or 'bearer' bonds, which provide payments to whomever holds the bond in-hand.

Principles of international law so fundamental that no nation may ignore them or attempt to contract out of them through treaties. For example, genocide and participating in a slave trade are thought to be jus cogens.

A way for two or more people to share ownership of real estate or other property. When two or more people own property as joint tenants and one owner dies, the other owners automatically own the deceased owner's share. For example, if a parent and child own a house as joint tenants and the parent dies, the child automatically becomes full owner. Because of this right of survivorship, no will is required to transfer the property; it goes directly to the surviving joint tenants without the delay and costs of probate.

A promise that pledges nothing, because it is vague or because the promisor can choose whether or not to honor it. Such promises are not legally binding. For example, if you get a new job and promise to work for three years, unless you resign sooner, you haven't made a valid contract and can resign or be fired at any time.

An extraordinary and unexpected natural event, such as a hurricane, tornado, earthquake or even the sudden death of a person. An act of God may be a defense against liability for injuries or damages. Under the law of contracts, an act of God often serves as a valid excuse if one of the parties to the contract is unable to fulfill his or her duties -- for instance, completing a construction project on time.