1. An opening between two rooms, especially a shelved space between a kitchen and dining room that is used for passing food.
2. A route through which something is permitted to pass.
3. A financial security collateralized by a portfolio of mortgages or other loans, the income from which is passed through an intermediary before being distributed to investors in fixed payments. Also called pass-through security.
4. The policy, practice, or act of paying for an increased cost by raising the price charged to one's customers or clients. Also called pass-along.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.