Skip to main contentThe Glossary provides definitions and explanations of key mortgage industry terms, concepts, and calculations that are fundamental to understanding how loans are priced, qualified, and structured.
This reference covers essential mortgage terminology including qualification metrics, pricing concepts, loan terms, and regulatory requirements. Use this glossary to understand the terminology used throughout the Pylon API and documentation.
What’s included
The glossary covers a wide range of mortgage industry concepts:
- Qualification metrics - DTI, LTV, CLTV, DSCR, and reserves calculations
- Pricing concepts - LLPA, points, rates, APR, and PITI
- Loan terms - Prepayment penalties, rate locks, and loan structures
- Regulatory requirements - TRID disclosures and compliance terms
Each term includes a detailed explanation of what it means, how it’s calculated, and how it’s used in the mortgage origination process.
How to use this glossary
Browse the glossary alphabetically or use the search function to find specific terms. Each entry provides:
- Clear definition of the term
- How it’s calculated or determined
- Its role in the loan origination process
- How it appears in the Pylon API
This glossary will continue to expand as we add more terms and concepts. 
