1. not present when expected to be; absent or lost
2. lacking or not included when it should be

Examples

• The police are searching for the missing child.
• Several pages are missing from this book.
• My keys have been missing for three days.
• The missing ingredient made the recipe taste bland.
• Two students were missing from class today.
• The missing puzzle piece was under the couch.
• Important details are missing from your report.