1. attest to the correctness and reliability of a financial item. A validity review or test is required by the ACCOUNTANT to satisfy the legitimacy of the item. An example of validation is the examination and approval of an employee's expense request form by a supervisor. Another example is the counting of petty cash to see that it conforms to the amount in the financial records.

2. make something legal or effective. An example is signing one's name to a bill of sale, which closes the deal.