Definitions:

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

Synonyms:

• interfere
• interpose
• step in