一いっ通つう

い

っ

つ

う

Meanings

Counter-like noun for a single document, letter, or similar item. Often used with 書類, 手紙, はがき, etc.

abbreviation

Abbreviation of 一方通行. Used in traffic contexts; may appear on signs or in casual speech.

〈物もの〉を一いっ通つう書かくto write one letter/document
お礼れいの手て紙がみを一いっ通つう書かいた。
I wrote one letter of thanks.
〈場ば所しょ〉が一いっ通つうになるfor a street to become one-way
この道みちは来らい月げつから一いっ通つうになる。
This street will become one-way starting next month.
一いっ通つうで〈動どう詞し〉to complete a hand with a pure straight (mahjong)
一いっ通つうで満まん貫がんを上あがった。
I won a mangan hand with a pure straight.
〈物もの〉を一いっ通つう送おくるto send one copy of a document
契けい約やく書しょを一いっ通つう送おくってください。
Please send one copy of the contract.

一いっ方ぽう通つう行こうN3sense 2
一方通行 is the full, formal term for one-way traffic, while 一通 is its casual, shortened form often seen on signs.
一いっ気き通つう貫かん sense 3
一気通貫 is the full mahjong term for the 1-9 pure straight hand, while 一通 is its common abbreviation.

一ひと通とおりN2
一通 (いっとう) means 'one copy/letter' of a document, while 一通り (ひととおり) is an adverbial noun meaning 'roughly' or 'in general' despite the shared kanji.

Compound of 一 (one) and 通 (counter for documents/letters). The traffic and mahjong senses are abbreviations of longer terms.