intransitive verb interfered -·fered′, interfering -·fer′·ing

1. to knock one foot or leg against the other: said of a horse
2. to come into collision or opposition; clash; conflict
3. 1. to come in or between for some purpose; intervene
   2. to meddle
4. Sports to be guilty of interference
5. Patent Law to claim priority for an invention, as when two or more applications for its patent are pending
6. Physics to affect each other by interference: said of two waves or streams of vibration
7. Radio, TV, etc. to create interference in reception

Etymology: OFr (s')entreferir, to strike (each other) < entre-, inter- + férir < L ferire, to strike < IE base *bher- > bore