1. a folder or container in an email system where incoming messages are stored
Usage: common in digital communication
2. a tray or container on a desk for holding incoming documents or mail
Usage: office or workplace context

Examples

• I have 47 unread messages in my inbox.
• She checked her email inbox first thing every morning.
• The inbox on my desk was overflowing with papers.
• You can organize your inbox by creating folders for different projects.
• He moved the important email to a separate folder to keep his inbox clean.
• The office assistant sorted the mail and placed it in each person's inbox.