pre-war

Short definition from Wiktionary

Adjective

1. 1
   Before a war.
2. 2
   Before a war: Before the most recent or significant war in a culture's history.
3. 3
   Before a war: Before the outbreak of World War I in 1914.
4. 4
   Before the outbreak of World War II in 1939: Especially pre-war architecture: buildings (particularly in and around New York) built between 1900 and about 1940.
5. 5
   Before the outbreak of World War II in 1939: Between the end of World War I in 1918 and the outbreak of World War II in 1939; interwar, especially Weimar Republic Germany.