Wartime is the period during which a war is being fought. Wartime rationing, in wartime.
It works as an adjective as often as a noun, since wartime anything means during the war. Wartime changes what a state may do, which is why emergency powers are written in advance.
1nounwartimeThe period during which a war is being fought.
“The wartime rules on food lasted nine years after the fighting stopped.”
wartime is a period.
From war + time.
Etymology from Wiktionary, CC BY-SA