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
    
3. Intervene without invitation or necessity, or unlawfully
   "She has a tendency to interfere in other people's business"
    
4. (physics, of waves) interact so as to reinforce or cancel each other
   "The two light waves interfered, creating a pattern of bright and dark fringes"
    
5. (sports) obstruct an opponent illegally in a game
   "The defender interfered, resulting in a penalty"
    
6. [Brit, informal] Sexually molest or assault (someone, especially a child)
   "He was accused of interfering with his students"

Derived forms: interfering, interfered, interferes

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

Encyclopedia: Interfere