Verb

• S: (v) intervene, step in, interfere, interpose (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?"
• S: (v) intervene (be placed or located between other things or extend between spaces and events) "This interludes intervenes between the two movements"; "Eight days intervened"
• S: (v) intervene (occur between other event or between certain points of time) "the war intervened between the birth of her two children"

Adjective

• S: (adj) intervening (occurring or falling between events or points in time) "so much had happened during the intervening years"