一通 いっつう Meanings Noun one copy (of a document); one letter one-way traffic See also: 一方通行 (いっぽうつうこう). pure straight (i.e.: winning hand containing nine consecutive tiles of the same suit (i.e. 1-9)) (sometimes written イッツー) See also: 一気通貫 (いっきつうかん). Kanji 一 one. Read as イチ. 通 pass through. Read as ツウ. Jinuma: Japanese Dictionary · Word lists