automatic deletion
Computing term for the automatic removal of data, messages, or files, often after a set period or condition.
This message will be automatically deleted after 24 hours.
To change the automatic deletion settings, please do so from the settings menu.
削除 is the general term for deletion, while 自動削除 specifies that the deletion happens automatically.
Compound of 自動 (automatic) and 削除 (deletion).