(a) Insured loan means a loan which has been insured as evidenced by the issuance of an Insurance Certificate or by the endorsement of the note for insurance by the Commissioner.

(b) Contract of insurance means the agreement evidenced by the issuance of an Insurance Certificate or by the endorsement of the Commissioner upon the note given in connection with an insured loan, incorporating by reference the regulations in §§ 203.440 et seq. and the applicable provisions of the Act.

(c) Insurance premium means the loan insurance premium paid by the financial institution to the Commissioner in consideration of the contract of insurance.

(d) Beginning of amortization means the date one month prior to the date of the first monthly payment to principal and interest.

(e) Maturity means the date on which the loan indebtedness would be extinguished if paid in accordance with periodic payments provided for in the original note and security instrument.

(f) Debentures means registered, transferable securities in book entry or certificated form which are valid and binding obligations, unconditionally guaranteed as to principal and interest by the United States.