Dictionary

To become involved in a situation, so as to alter or prevent an action.

Example: The police had to be called to intervene in the fight.

To occur, fall, or come between, points of time, or events.

Example: An instant intervened between the flash and the report.

To occur or act as an obstacle or delay.

Example: Nothing intervened to prevent the undertaking.

To say (something) in the middle of a conversation or discussion between other people, or to respond to a situation involving other people.

Intervention; mediation

That intervenes or mediates.

Falling between two periods or events.