To come or be between persons or things; to be situated between. Thus the Atlantic intervenes between Europe and America; the Mediterranean intervenes between Europe and Africa.

To come between points or time or events; as the period that intervened between the treaty of Ryswick and the treaty of Utrecht.

To happen in a way to disturb, cross or interrupt. Events may intervene to frustrate our purposes or wishes.

To interpose or undertake voluntarily for another. A third party may intervene and accept a bill of exchange for another.

A coming between.