This is the 7385th most frequent Japanese word.
件名
Subject.
The word '件名' refers to the subject line of a form or email.
件名を記入してください。
Please fill in the subject.
Here, '件名' is used to specify the title or topic of a written communication.
件名は「会議の予定変更」です。
The subject is 'Change in meeting schedule'.
In this instance, '件名' implies the need to summarize or clarify the email's content in its subject line.