Second World War

World War II, war between the Axis and the Allies which began in 1939 when Germany invaded Poland and ended with the surrender of Germany and Japan 1945

World War II or the Second World War, often abbreviated as WWII or WW2, was a worldwide military conflict; the amalgamation of two separate conflicts, one beginning in Asia, 1937, as the Second Sino-Japanese War and the other beginning in Europe, 1939, with the invasion of Poland. It is regarded as the historical successor to World War I.
See more at Wikipedia.org...

Noun
1. a war between the Allies (Australia, Belgium, Bolivia, Brazil, Canada, China, Colombia, Costa Rica, Cuba, Czechoslovakia, Dominican Republic, El Salvador, Ethiopia, France, Greece, Guatemala, Haiti, Honduras, India, Iran, Iraq, Luxembourg, Mexico, Netherlands, New Zealand, Nicaragua, Norway, Panama, Philippines, Poland, South Africa, United Kingdom, United States, USSR, Yugoslavia) and the Axis (Albania, Bulgaria, Finland, Germany, Hungary, Italy, Japan, Rumania, Slovakia, Thailand) from 1939 to 1945
(synonym) World War II, World War 2
(hypernym) world war
(part-meronym) Bataan, Corregidor
(class) Free French, Fighting French