Contract where each party promises performance. (source: http://www.investorwords.com/14138/bilateral_contract.html)

Insincerity, dishonesty, duplicity.

To solemnly declare verbally or in writing that a particular document or testimony about an event is a true and accurate representation of the facts;

A person who is authorized to perform business-related transactions on behalf of someone else (the principal). In order to become someone’s attorney in fact, a

A process in which a disagreement between two or more parties is resolved by impartial individuals, called arbitrators, in order to avoid costly and lengthy

A process for requesting a formal change to an official decision. (fuente: http://en.wikipedia.org/wiki/Appeal)

A change or addition to a legal document which, when properly signed, has the same legal power as the original document. (source: investorwords)