inter-war

/IH0 N T ER1 W AO0 R/
adjective
  1. 1

    During or relating to the period of time between two wars, especially the two World Wars (1919–1939).

    His family emigrated to America in the interwar years.

Source: https://en.wiktionary.org/wiki/inter-war, https://en.wiktionary.org/wiki/interwar