一通
1
one copy (of a document);one letter
一通に署名の上ご返送ください。
Please return one set to us with your signature.
2
one-way traffic
See also:
一方通行 (いっぽうつうこう)
3
pure straight;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)