Underwriter
A securities broker or dealer that purchases bonds from an issuer and resells them to investors.
The amount, if any, required to be paid to the Issuer by the Underwriter at the time the Bonds are sold, which serves as the amount retained by the Issuer as compensation for any damages caused to the Issuer by the Underwriter failing to purchase the Bonds at the Closing.
A securities broker or dealer that purchases bonds from an issuer and resells them to investors.

Rule outlined in Section 147(b) of the code that states private activity bonds are not tax-exempt bonds if the weighted average maturity of the bond issue exceeds 120% of the average reasonably expected economic useful life of the facilities financed with the bond proceeds.