The following terms shall have the following meanings:
(a) The term “local agency” means public district, public corporation, authority, agency, board, commission, county, city and county, city, school district, or other public entity or any improvement district or zone thereof.
(b) The term “bonds” as used in this article means: bonds as defined in Section 53550, or revenue bonds as defined in Section 53570.
(c) The term “refunding bonds” means bonds issued to refund bonds.
(d) The term “federal securities” as used in this article means those securities defined in subdivision (g) of Section 53550 and in subdivision (a) of Section 53651.