Parity Debt
Two or more issues of bonds with the same priority of claim or lien on the same underlying security and sources of repayment (i.e., revenues) for all of the bonds.
Additional Bonds and the related “Additional Bonds test” are concepts often found in a Master Indenture, Bond Resolution/Ordinance and related documentation. Additional Bonds are Bonds which may be issued in the future under the same Master Indenture, Bond Resolution/Ordinance, and related documentation upon meeting certain conditions designed to ensure that the revenues available to repay the original Bonds, any currently outstanding Additional Bonds, and the proposed Additional Bonds will be sufficient (the “Additional Bonds test”).
Two or more issues of bonds with the same priority of claim or lien on the same underlying security and sources of repayment (i.e., revenues) for all of the bonds.

An attorney or firm of attorneys, frequently retained by the Issuer but sometimes by another party to the transaction, to render an opinion in a bond financing as to the validity and enforceability of the bonds and the treatment of the interest on the bonds under the code and applicable state law.