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

Type of: mail

• invention
• inventive
• inventively
• inventiveness
• inventor
• inventory
• inventory accounting
• inventory control
• inventory item
• inventory-clearance sale
• inventorying
• prayerful
• praying mantid
• praying mantis
• prazosin
• PRC
• pre-
• pre-Christian
• pre-Columbian
• pre-contract
• pre-embryo
• pre-emptive strike
• pre-Jurassic
• pre-nup
• Pre-Raphaelite