Base Offering Circular – Multifamily 88 Trust REMIC.............................  Any REMIC formed from an Asset Pool of a Trust. Trustee.......................................  The person identified in a Trust Agreement or MX Trust Agreement as trustee for the related trust. Trustee Fee................................  For each Series, with respect to each Distribution Date, the fee payable to the Trustee, as provided in the related Trust Agreement. Trustee Fee Rate........................  The per annum fee rate, if any, designated in the Trust Agreement, at which the Trustee Fee accrues. Underlying Callable Security....  For any Ginnie Mae Guaranteed Callable Pass-Through Security denominated as a Callable Class Security and guaranteed by Ginnie Mae under the Ginnie Mae Multiclass Securities Program.   Underlying Callable Security Payment Date ............................ For any Underlying Callable Security, the day of each month on which payment is required to be made to the Holder of that Underlying Callable Security.   Underlying Callable Series .......  A Series of Ginnie Mae Guaranteed Pass Through Securities issued pursuant to a callable trust agreement and having the numerical or other designation specified in the related trust agreement. Underlying Certificate...............  As to any Ginnie Mae REMIC Trust, any previously issued REMIC certificate backed by Ginnie Mae Multifamily Certificates, and any Certificate conveyed thereto by the related Sponsor. Underlying Certificate Factor ...  With respect to each Underlying Certificate, the factor provided by the related issuer, information agent or trustee for such Underlying Certificate. Underlying Certificate Payment Date ............................ With respect to an Underlying Certificate, the day of each month on which payment is required to be made to the holder of such Underlying Certificate. Underlying Certificate Disclosure Documents .............. The prospectus, offering circular or other disclosure document pursuant to which an Underlying Certificate was offered. Underlying REMIC Security ....  Any Ginnie Mae Securities conveyed to an MX Trust by a Sponsor pursuant to an MX Trust Agreement.   Underlying Series......................  As to each Underlying Certificate, the related Series of certificates.