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The basis of a contract. Consideration is a benefit or right for which the parties to a contract must bargain; the contract is founded on an exchange of one form of consideration for another. Consideration may be a promise to perform a certain act -- for example, a promise to fix a leaky roof -- or a promise not to do something, such as build a second story on a house that will block the neighbor's view. Whatever its particulars, consideration must be something of value to the people who are making the contract.

When a landlord provides housing that is so substandard that a landlord has legally evicted the tenant. For example, if the landlord refuses to provide heat or water or refuses to clean up an environmental health hazard, the tenant has the right to move out and stop paying rent, without incurring legal liability for breaking the lease.

The right of a property owner or tenant to enjoy his or her property without interference. Disruption of quiet enjoyment may constitute a nuisance. Leases and rental agreements often contain a 'covenant of quiet enjoyment,' expressly obligating the landlord to see that tenants have the opportunity to live undisturbed.

A member of the governing board of a corporation, typically elected at an annual meeting of the shareholders. Directors are responsible for making important business decisions -- especially those that legally bind the corporation -- leaving day-to-day management to officers and employees of the corporation. For example, a decision to borrow money, lease an office or buy real property would normally be authorized by the board of directors. However, in the small business world, where it is common for owners to be directors, officers and employees simultaneously, distinctions dividing the roles and responsibilities of these groups are often blurred.

A provision in a contract stating that some or all of the terms of the contract will be altered or voided by the occurrence of a specific event. For example, a contingency in a contract for the purchase of a house might state that if the buyer does not approve the inspection report of the physical condition of the property, the buyer does not have to complete the purchase.

A type of bond (an interest-bearing document that serves as evidence of a debt) that does not require security in the form of a mortgage or lien on a specific piece of property. Repayment of a debenture is guaranteed only by the general credit of the issuer. For example, a corporation may issue a secured bond that gives the bondholder a lien on the corporation's factory. But if it issues a debenture, the loan is not secured by any property at all. When a corporation issues debentures, the holders are considered creditors of the corporation and are entitled to payment before shareholders if the business folds.

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.

An unconditional right to receive real property at some point in the future. A vested interest may be created by a deed or a will. For example, if Julie's will leaves her house to her daughter, but the daughter gains possession only after Julie's husband dies, the daughter has a vested remainder in the house.