INTERVENING

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.

To come between, or to be between, persons or things.

Example: "The mediterranean intervenes between europe and africa."

In a suit to which one has not been made a party, to put forward a defense of one's interest in the subject matter.

Example: "An application for leave (i.e. permission) to intervene"