一件

one item, one thing

i k̚ k ẽ̞ ɴ
noun Rare #40,701
one item, one thing Used as a counter for clothing and other relatively small objects; also used as a noun meaning “one matter” or “one case.”
JA: シャツを一件買いました。
EN: I bought one shirt.

一件メールいただきありがとうございました

Thank you for your email regarding that matter.

彼はその一件を調査し始めた

He began investigating the matter.