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A security that has a lower priority compared to another in the event of liquidation. That is, if a company goes bankrupt and is liquidated, holders of secured debt must be paid before the holders of unsecured debt. Holders of unsecured debt must be paid before preferred shareholders, and finally, preferred shareholders must be satisfied before common shareholders. In the forgoing, each security is a junior issue compared to the previous one. See also: Absolute Priority Rule.