Vocabulary What does 空軍 (くうぐん, kuugun) mean? 空軍 (くうぐん, kuugun) means air force. Quick factsReadingくうぐんRomajikuugunPart of speechnoun 空軍くうぐんkuugunair force1noun air forceKanji in this word空sky; empty軍army, military