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

Type of: mail

• Alderney
• aldohexose
• aldol
• aldol reaction
• Aldomet
• aldose
• aldosterone
• aldosteronism
• Aldous Huxley
• Aldous Leonard Huxley
• aldrin
• Aldrovanda
• Aldrovanda vesiculosa
• ale
• ale drinker
• aleatory
• aleatory contract
• alec
• Alec Douglas-Home
• Alec Guinness
• aleck
• alecost
• Alectis
• Alectis ciliaris
• Alecto