Class B-6 Optimal Principal Amount. As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class B-6 Optimal Principal Amount. As to any Distribution Date, an amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class B-6 Optimal Principal Amount. As to any Distribution Date and each Outstanding Mortgage Loan, an amount equal to the sum of

Class B-4 Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class B-5 Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class B-2 Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class B-3 Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class B-1 Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class A-PO Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum as to each Outstanding Mortgage Loan, of the product of (x) the PO Fraction with respect to such Mortgage Loan and (y) the sum of:

Class A Non-PO Optimal Principal Amount As to any Distribution Date, an amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan, and (y) the sum of:

Senior Optimal Principal Amount As to a Mortgage Pool and with respect to each Distribution Date, an amount equal to the sum of:

Class P Principal Amount As of the Closing Date, $100.

Class Principal Amount With respect to each Class of Certificates other than any Class of Notional Certificates, the aggregate of the Certificate Principal Amounts of all Certificates of such Class at the date of determination. With respect to each Class of Notional Certificates, zero.

Notional Principal Amount For calculating interest payments, on each Class of outstanding Interest Only MAC Notes as of any Payment Date, an amount equal to the outstanding Class Principal Balance as of such Payment Date of the portion of the related Class of Class M Notes that was exchanged for such Interest Only MAC Note.

Initial Principal Amount means, with respect to any Series or Class (or Subclass) of Notes, the aggregate initial principal amount of such Series or Class (or Subclass) of Notes specified in the applicable Series Supplement.

PO Principal Amount As to any Distribution Date and Loan Group, the sum of the applicable PO Percentage of (a) the principal portion of each Monthly Payment due on each Mortgage Loan in such Loan Group on the related Due Date, (b) the Stated Principal Balance, as of the date of repurchase, of each Mortgage Loan in such Loan Group that was repurchased by the Depositor pursuant to this Agreement as of such Distribution Date, (c) any Substitution Adjustment Amount in connection with any Defective Mortgage Loan in such Loan Group received with respect to such Distribution Date, (d) any Liquidation Proceeds allocable to recoveries of principal of Mortgage Loans in such Loan Group that are not yet Liquidated Mortgage Loans received during the calendar month preceding the month of such Distribution Date, (e) with respect to each Mortgage Loan in such Loan Group that became a Liquidated Mortgage Loan during the calendar month preceding the month of such Distribution Date, the amount of Liquidation Proceeds (excluding Excess Proceeds) allocable to principal received with respect to such Mortgage Loan during the calendar month preceding the month of such Distribution Date with respect to such Mortgage Loan and (f) all Principal Prepayments received on the Mortgage Loans in such Loan Group received during the calendar month preceding the month of such Distribution Date.

Subordinated Optimal Principal Amount With respect to each Mortgage Pool and each Distribution Date, an amount equal to the sum of the following (but in no event greater than the aggregate Class Certificate Balances of the Subordinated Certificates immediately prior to such Distribution Date):

Original Principal Amount means $296,000,000 for the Class A-1 Notes, $330,000,000 for the Class A-2a Notes, $100,000,000 for the Class A-2b Notes, $428,000,000 for the Class A-3 Notes and $96,000,000 for the Class A-4 Notes.

Non-PO Principal Amount As to any Distribution Date and Loan Group, the sum of (i) the sum of the applicable Non-PO Percentage of (a) the principal portion of each Monthly Payment due on each Mortgage Loan in such Loan Group on the related Due Date, (b) the Stated Principal Balance, as of the date of repurchase, of each Mortgage Loan in such Loan Group that was repurchased by the Depositor pursuant to this Agreement as of such Distribution Date, (c) any Substitution Adjustment Amount in connection with a Defective Mortgage Loan in such Loan Group received with respect to such Distribution Date, (d) any Liquidation Proceeds allocable to recoveries of principal of Mortgage Loans in such Loan Group that are not yet Liquidated Mortgage Loans received during the calendar month preceding the month of such Distribution Date, (e) with respect to each Mortgage Loan in such Loan Group that became a Liquidated Mortgage Loan during the calendar month preceding the month of such Distribution Date, the amount of Liquidation Proceeds (excluding Excess Proceeds) allocable to principal received with respect to such Mortgage Loan during the calendar month preceding the month of such Distribution Date and (f) all Principal Prepayments on the Mortgage Loans in such Loan Group received during the calendar month preceding the month of such Distribution Date; and (ii) the Non-PO Recovery for such Distribution Date.

Subordinate Optimal Principal Amount For any Distribution Date and any Loan Group, the sum for each Mortgage Loan in such Loan Group of (i) the Subordinate Percentage of (a) the principal portion of each Scheduled Payment (without giving effect, prior to the Bankruptcy Coverage Termination Date, to any reductions thereof caused by any Debt Service Reductions or Deficient Valuations) due on each such Mortgage Loan on the related Due Date, (b) the principal portion of the Purchase Price of each such Mortgage Loan to the extent it was repurchased by the Transferor pursuant to this Agreement as of such Distribution Date, (c) the Substitution Adjustment Amount in connection with any Deleted Mortgage Loan related to such Loan Group received with respect to such Distribution Date, (d) any Liquidation Proceeds (including Insurance Proceeds) allocable to recoveries of principal of Mortgage Loans related to such Loan Group that are not yet Liquidated Loans, received during the calendar month preceding the month of such Distribution Date, (ii) with respect to each Mortgage Loan in such Loan Group that became a Liquidated Loan during the calendar month preceding the month of such Distribution Date, the portion of the amount of the Liquidation Proceeds allocable to principal received with respect to such Mortgage Loan that was not included in clause (ii) of the definition of "Senior Optimal Principal Amount" for such Distribution Date, (iii) the Subordinate Prepayment Percentage of the sum of (a) all Principal Prepayments in Full of Mortgage Loans in such Loan Group received during the related Prepayment Period and (b) all partial Principal Prepayments of Mortgage Loans in such Loan Group and applied during the related Prepayment Period and (iv) with respect to any Distribution Date prior to the Cross-Over Date only, the Subordinate Prepayment Percentage related to such Group of the Recoveries received during the related Prepayment Period; provided, however, that if a Bankruptcy Loss that is an Excess Loss is sustained with respect to a Mortgage Loan in such Loan Group that is not a Liquidated Loan, the Subordinate Optimal Principal Amount will be reduced on the related Distribution Date by the Subordinate Percentage of the principal portion of such Bankruptcy Loss.

Current Principal Amount With respect to any Certificate (other than an Interest Only Certificate) as of any Distribution Date, the initial principal amount of such Certificate, and reduced by (i) all amounts distributed on previous Distribution Dates on such Certificate with respect to principal, (ii) the principal portion of all Realized Losses allocated prior to such Distribution Date to such Certificate, taking account of the Loss Allocation Limitation and (iii) in the case of a Subordinate Certificate, such Certificate's pro rata share, if any, of the applicable Subordinate Certificate Writedown Amount for previous Distribution Dates. With respect to any Class of Certificates (other than an Interest Only Certificate), the Current Principal Amount thereof will equal the sum of the Current Principal Amounts of all Certificates in such Class. Notwithstanding the foregoing, solely for purposes of giving consents, directions, waivers, approvals, requests and notices, the Class R-I, Class R-II and Class R-III Certificates after the Distribution Date on which they each receive the distribution of the last dollar of their respective original principal amount shall be deemed to have Current Principal Amounts equal to their respective Current Principal Amounts on the day immediately preceding such Distribution Date.

Aggregate Principal Amount means, as of any date of calculation, the principal amount or Accreted Value of the Bonds referred to.

PO Formula Principal Amount As to any Distribution Date and Class PO Component, the sum of the applicable PO Percentage of (a) the principal portion of each Scheduled Payment (without giving effect, prior to the Bankruptcy Coverage Termination Date, to any reductions thereof caused by any Debt Service Reductions or Deficient Valuations) due on each Mortgage Loan in the related Loan Group on the related Due Date, (b) the Stated Principal Balance of each Mortgage Loan in the related Loan Group that was repurchased by the Seller or the Master Servicer pursuant to this Agreement as of such Distribution Date, (c) the Substitution Adjustment Amount in connection with any Deleted Mortgage Loan in the related Loan Group received with respect to such Distribution Date, (d) any Insurance Proceeds or Liquidation Proceeds allocable to recoveries of principal of Mortgage Loans in the related Loan Group that are not yet Liquidated Mortgage Loans received during the calendar month preceding the month of such Distribution Date, (e) with respect to each Mortgage Loan in the related Loan Group that became a Liquidated Mortgage Loan during the month preceding the calendar month of such Distribution Date, the amount of Liquidation Proceeds allocable to principal received with respect to such Mortgage Loan during the month preceding the month of such Distribution Date with respect to such Mortgage Loan, (f) all Principal Prepayments with respect to the Mortgage Loans in the related Loan Group received during the related Prepayment Period and (g) on the last Conveyance Period Distribution Date, the Remaining PO Supplemental Loan Amount.

Lower-Tier Principal Amount As described in the Preliminary Statement.

Certificate Principal Amount With respect to any Certificate, at the time of determination, the maximum specified dollar amount of principal to which the Holder thereof is then entitled hereunder, such amount being equal to the initial principal amount set forth on the face of such Certificate, less (i) the amount of all principal distributions previously made with respect to such Certificate; (ii) all Realized Losses allocated to such Certificate; and (iii) in the case of a Subordinate Certificate, any Subordinate Certificate Writedown Amount allocated to such Certificates. Notwithstanding the foregoing, on any Distribution Date relating to a Due Period in which a Subsequent Recovery has been received by the Servicer, the Certificate Principal Amount of any Class of Certificates then outstanding for which any Realized Loss or any Subordinate Certificate Writedown Amount has been applied will be increased, in order of seniority, by an amount equal to the lesser of (i) the amount such Class of Certificates has been written down in respect of Realized Losses or Subordinate Certificate Writedown Amounts, to the extent not previously offset by increases in Certificate Principal Amount pursuant to this sentence and (ii) the total of any Subsequent Recovery distributed on such date to the Certificateholders (reduced (x) by the amount of the increase in the Certificate Principal Amount of any more senior Class of Certificates pursuant to this sentence on such Distribution Date and (y) to reflect a proportionate amount of the increase in the Certificate Principal Amount of any pari passu Class of Certificates on such Distribution Date pursuant to this sentence). For purposes of Article V hereof, unless specifically provided to the contrary, Certificate Principal Amounts shall be determined as of the close of business of the immediately preceding Distribution Date, after giving effect to all distributions made on such date.

Collateral Principal Amount means on any date of determination (A) the aggregate principal balance of the Portfolio, including the funded and unfunded balance on any Delayed Funding Term Loan or Revolving Loan, as of such date plus (B) the amounts on deposit in the Accounts (including cash and Cash Equivalents) representing Principal Proceeds as of such date minus (C) the aggregate principal balance of all Ineligible Investments as of such date.

Maximum Principal Amount the meaning set forth in Section 2.1(a).

Original Class B-1 Principal Balance The Class B-1 Principal Balance as of the Cut-Off Date, as set forth in Section 11.15.