Pronunciation: (in"tur-fēr'),[key] —v.i.,-fered, -fer•ing. 1. to come into opposition, as one thing with another, esp. with the effect of hampering action or procedure (often fol. by with): Constant distractions interfere with work. 2. to take part in the affairs of others; meddle (often fol. by with or in): to interfere in another's life. 3. (of things) to strike against each other, or one against another, so as to hamper or hinder action; come into physical collision.
4. to interpose or intervene for a particular purpose.
5. to strike one foot or leg against another in moving, as a horse.
6. Sports. a. to obstruct the action of an opposing player in a way barred by the rules.
b. Football.to run interference for a teammate carrying the ball.
7. Physics.to cause interference.
8. to clash; come in collision; be in opposition: The claims of two nations may interfere. 9. Law.to claim earlier invention when several patent requests for the same invention are being filed.
10. interfere with,Chiefly Brit.to molest sexually.