Definitions

1. noun

The first of two global conflicts in the 20th century, fought between the Allies, which included France, Britain, Russia, and the United States, and the Central Powers, which included Germany, Austria-Hungary, and the Ottoman Empire, from 1914 to 1918.

“The historian specialized in the study of WWI and its impact on international relations.”

2. abbreviation

World War I

“The museum exhibit was dedicated to the history of WWI and its causes.”