Vocabulary What does 海軍 (かいぐん, kaigun) mean? 海軍 (かいぐん, kaigun) means navy; naval force. Quick factsReadingかいぐんRomajikaigunPart of speechnoun 海軍かいぐんkaigunnavy; naval force1noun navy; naval forceKanji in this word海sea軍army, military