What best defines an armistice? germany sinks the lusitania. japan enters the war in 1914 on the side of great britain. germany ends hostilities on november 11, 1918.

I believe the answer is: Germany ends hostilities on November 11, 1918.

Armstice refers to the act of the act of temporary stopping a war for a certain period of time. During this process, each countries would send their representatives to negotiate terms of possible treaty and see whether they could obtain an agreement or should continue the warfare.