n. the latin 'alter ego' stands for 'other I'. It is used to mean another self or a second personality within a person. Legally it is used to refer to some entity set up to act in the name of another person or corporation in legal matters. It is usually used as a cover to save the defendant from disgrace or to save some firms' reputation. Proving the use of alter ego would be a case of piercing the corporate veil in order to obtain a judgment against the principals or the individuals behind the alter ego, instead of the corporation/firm itself.