World Wars

A world war is a war involving many of the countries of the world or many of the most powerful and populous ones. World wars span multiple countries on multiple continents, with battles fought in multiple theaters. While a variety of global conflicts have been subjectively deemed 'world wars,' the term is applied to the two major international conflicts that occurred during the twentieth century: World War I (1914–1918) and World War II (1939–1945) respectively.

The Oxford English Dictionary cited the first known usage in the English language to a Scottish newspaper: the People's Journal in 1848, “A war among the great powers is now necessarily a world-war.” The term, “world war” had been used in 1850 by Karl Marx and his associate Friedrich Engels in The Class Struggles in France. Rasmus B. Anderson in 1889 described an episode in Teutonic mythology as a “world war” (Swedish: världskrig), justifying this description by a line in an Old Norse epic poem, "Völuspá: folcvig fyrst i heimi" ("The first great war in the world".) German writer August Wilhelm Otto Niemann had used the term "world war" in the title of his anti-British novel, Der Weltkrieg: Deutsche Träume (The World War: German Dreams) in 1904, published in English as The Coming Conquest of England.

In English, the term "First World War" had been used by Charles à Court Repington as a title for his memoirs (published in 1920) having noted his discussion on the matter with a Major Johnstone of Harvard University in his diary entry of September 10, 1918. The term "World War I" was coined by Time magazine in its issue of June 12, 1939. In the same article, the term "World War II" was first used speculatively to describe the upcoming war. The first use for the actual war came in its issue of September 11, 1939. One week earlier, on September 4, the day after France and the United Kingdom declared war on Germany, the Danish newspaper Kristeligt Dagblad used the term on its front page, saying "The second World War broke out yesterday at 11 a.m."

...
Wikipedia