intervene intervene /ˌɪntɝˈviːn/

verb

1. () Get involved, so as to alter or hinder an action, or through force or threat of force  ( interpose , step in , interfere , intervene )
   get involved, so as to alter or hinder an action, or through force or threat of force
    Why did the U.S. not intervene earlier in WW II?
   Why did the U.S. not intervene earlier in WW II?
   
2. Occur between other event or between certain points of time  ( intervene )
   occur between other event or between certain points of time
    The war intervened between the birth of her two children
   the war intervened between the birth of her two children
   
3. Be placed or located between other things or extend between spaces and events  ( intervene )
   be placed or located between other things or extend between spaces and events
    This interludes intervenes between the two movements
   This interludes intervenes between the two movements
    Eight days intervened
   Eight days intervened