intr.v. in·ter·fered, in·ter·fer·ing, in·ter·feres
1. To be or create a hindrance or obstacle: The rain interfered with our plans to go on a picnic.
2. Sports To perform an act of interference.
3. To intervene or intrude in the affairs of others; meddle.
4. To strike one hoof against the opposite hoof or leg while moving. Used of a horse.
5. Physics & Electronics To cause interference.
[Middle English enterferen, from Old French s'entreferer, to strike one another : entre-, between (from Latin inter-; see INTER-) + ferir, to strike (from Latin ferīre).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.