An indenture is a legal form or agreement between parties, with some agreements involving up to two or three separate parties alone. An indenture agreement is a legally binding document or contract that establishes terms and conditions between two or more parties."Niobrara Collateral" shall have the meaning given to such term in the 2017 Notes Indenture. 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. "Secured Obligations" means all Obligations in respect of the Notes or this Indenture. Indenture shall have the same meanings in this Series Supplement (other than in the form of Series. "Series Supplement" means any indenture supplemental to the Indenture in the form attached as. 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. "Pledged Collateral" has the meaning specified in the Pledge Agreement.