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

Type of: mail

• authenticity
• authigenic
• author
• author's name
• authoress
• authorial
• authoring language
• authorisation
• authorise
• authorised
• Authorised Version
• authoriser
• authoritarian
• authoritarian regime
• authoritarian state
• authoritarianism
• authoritative
• authoritatively
• authorities
• authority
• authority figure
• authorization
• authorize
• authorized
• authorized shares