noun, counter
matter; affair; case; item; subject
General noun for a matter, affair, or case. Also used as a counter for matters or items in formal contexts.
その件については後で話しましょう。
Let's talk about that matter later.
先日の件、ご確認いただけましたか
Regarding the matter from the other day, have you been able to check it?
counter
counter for received messages
Counter for received emails, text messages, voicemails, etc. Used with numbers to count incoming communications.
昨日、メールを３件受け取りました。
I received three emails yesterday.
留守電に２件メッセージが入っていました。
There were two voicemail messages.
counter
counter for online accounts
Counter for accounts on websites, email services, etc. Used when referring to the number of user accounts.
このサービスには３件のアカウントを登録できます。
You can register up to three accounts on this service.
不正なアカウントが５件見つかりました。
Five fraudulent accounts were found.