1) Under 
• (imp. & p. p.) of Subordinate
A claim ranked lower in priority than other claims. Common stock claims are always subordinated to debt.
Adjective. A particular debt issue is said to be subordinated if it was senior but because of a subsequent issue of debt by the same firm is no longer senior. One says, 'subordinated debt'. Contexts: finance
Is a class of securities which have lower priority or claim against a borrower. Typically, these are unsecured obligations. They are also called Junior notes and bonds. This compares to Senior and Secured. 
noting or designating a debt obligation whose holder is placed in precedence below secured and general creditors: subordinated debentures.