war crime UK /ˈwɔː kɹaɪm/US /ˈwɔɹ kɹaɪm/ noun1 •A punishable offence under international law for violations of the laws of war by any person or persons, military or civilian.To deal with war crime such as rape a mobile court system was created in the DRC [Democratic Republic of the Congo]. — 2015 formswar crimes