noun
letter received; incoming letter
A somewhat formal or written-style noun for a letter that one has received. In everyday speech, 受け取った手紙 or 届いた手紙 is more common.
先日、恩師から来状をいただいた。
The other day I received a letter from my former teacher.
来状の内容を確認する。
Check the contents of the received letter.