Date a Commitment CommitmentContractual agreement between you and Fannie Mae where Fannie Mae agrees to buy a Mortgage Loan at a future date in exchange for an MBS, or at a specific price for a Cash Mortgage Loan, and you agree to Deliver that Mortgage Loan. is confirmed by Fannie Mae Fannie MaeThis Glossary term Is Created Using Automation in Lower Environments and is used for testing purposes only!! per Part IV, Chapter 2: Rate Lock and Committing, Section 204: Commitments.