WordWeb Online

1. Come between so as to be hindrance or obstacle
   "Your talking interferes with my work!"
    
2. Get involved, so as to alter or hinder an action, or through force or threat of force
   "Why did the U.S. not interfere earlier in WW II?";
   - intervene, step in, interpose

Derived forms: interfered, interfering, interferes

Type of: entrammel [literary], fetter [literary], hinder, impede, interact, trammel [literary]

Encyclopedia: Interfere