An indenture agreement is a legally binding document or contract that establishes terms and conditions between two or more parties. Indenture refers to a legal and binding agreement, contract, or document between two or more parties.A mortgage indenture is a final agreement between a lender and a borrower that sets the terms and conditions of a loan agreement between them. A contract between an Issuer and a Trustee (normally a commercial bank with trust powers) under which the Issuer issues Bonds and specifies their Maturities. An indenture, signed at the closing of the issuance of the notes, is a contract between the issuer of the notes, any guarantors of the debt and the trustee. For all purposes of this Supplemental Indenture: (a). Capitalized terms used herein without definition shall have the meanings specified in the Indenture;. (b). Indenture is a legal contract between a borrower and a lender that outlines the terms and conditions of a debt issue. Learn about types, terms and sig. This document establishes the XXXXX XXXXXXX XXXXXX Trust.