ＰＫＯ LinksSentence search for ＰＫＯSentence search for ピー・ケー・オーEdit in JMdict Noun1. peacekeeping operations; PKOSee also 平和維持活動Noun2. price-keeping operation; PKOSee also 株価維持操作 Discussions Log in to talk about this word.