まんひと 万に一つ LinksSentence search for 万に一つSentence search for まんにひとつSentence search for 万にひとつKanji details for 万 and 一Edit in JMdict Expressions (phrases, clauses, etc.), Noun which may take the genitive case particle 'no'1. one in a million (chance, etc.); one in ten thousand; in the unlikely event thatOther forms万にひとつ 【まんにひとつ】 Discussions Log in to talk about this word.