1. Mail that includes letters and postcards and packages sealed against inspection
   - first class, 1st class, first-class mail

Type of: mail

• common wormwood
• common year
• common yellowthroat
• common yellowwood
• common zebra
• common-law marriage
• commonage
• commonality
• commonalty
• commoner
• commonly
• commonness
• commonplace
• commonplace book
• commonplaceness
• commons
• commonsense
• commonsensible
• commonsensical
• commonweal
• commonwealth
• commonwealth country
• Commonwealth Day
• Commonwealth of Australia
• Commonwealth of Dominica