What does Britannica mean?

Pax Britannica (Latin for "the British Peace", moDELLed after Pax Romana) was the period of relative peace in Europe (1815-1914) when the British Empire controlled most of the key maritime trade routes and enjoyed unchallenged sea power. It refers to a period of British Imperialism after the 1815 Battle of Waterloo, which led to a period of overseas British expansionism.