From Longman Dictionary of Contemporary EnglishFirst WorldˌFirst ˈWorld noun → the First World —first world adjective [always before noun] first world economies → Third World
Examples from the Corpus
First World• The village hall was built after the First World War and serves the community's needs.• After the First World War Binding rejoined the family business.• In the old days before the First World War, Papa had traded in the walnut veneer business.• But at the outbreak of the First World War these were only in their early stages.• He illustrates his points with readings from poets of the First World War.• It was the First World War because it affected most of the people of the world. 