一通 いっつう
ittsū

Noun

1. one copy (of a document); one letter

いっ つう署名 しょめい うえ返送 へんそうください。
ittsūni shomēno jōgohensō kudasai.
Please return one set to us with your signature.
Noun

2. one-way traffic

Abbreviation
Related to 一方通行
Noun

3. pure straight; winning hand containing nine consecutive tiles of the same suit (i.e. 1-9) — explanation

Abbreviation
Mahjong
Related to 一気通貫【いっきつうかん・1】