1. Occurring every six months or during every period of six months
   - semestral

See also: periodic, periodical, semester

• premenopausal
• premenstrual
• premenstrual syndrome
• premie
• premier
• premiere
• premiership
• premillennial
• premillennialism
• premise
• premises
• premiss
• premium
• Premium Bond
• premix
• premolar
• premonition
• premonitory
• Prenanthes
• Prenanthes alba
• Prenanthes purpurea
• Prenanthes serpentaria
• prenatal
• prenatal diagnosis
• prenominal