ＯＮ Common word LinksSentence search for ＯＮSentence search for オンEdit in JMdict Noun1. (switched) onUsually written using kana alone, See also オフNoun, Suru verb, Transitive verb, Intransitive verb2. being on the green (of one's ball)Golf, Usually written using kana alone Discussions Log in to talk about this word.