Rating
A judgment by a rating agency as to the credit quality of a bond.
The lowering of a Rating by a Rating Agency. Lower Ratings indicate lower credit quality.
A judgment by a rating agency as to the credit quality of a bond.
The increasing of a rating by a rating agency. Higher ratings indicate higher credit quality.

The term used in Section 145 of the code to refer to a type of tax-exempt bonds issued as private activity bonds for the benefit of a 501(c)(3) organization.