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

Type of: mail

• crispness
• crispy
• crisscross
• crisscrossed
• cristal
• Cristobal Balenciaga
• Cristobal Colon
• cristobalite
• Cristoforo Colombo
• criterial
• criterion
• criterional
• crith
• critic
• critical
• critical analysis
• critical angle
• critical appraisal
• critical mass
• critical point
• critical review
• criticality
• critically
• criticalness
• criticaster