1. Occurring or payable twice each year
   - semiannual, biannual, biyearly

1. Every half year, every six months

See also: periodic, periodical

• Copernican
• Copernican system
• Copernicia
• Copernicia alba
• Copernicia australis
• Copernicia cerifera
• Copernicia prunifera
• Copernicus
• copesetic
• copesettic
• copestone
• copier
• copilot
• coping
• coping saw
• coping stone
• copious
• copiously
• copiousness
• coplanar
• Copland
• Copley
• copolymer
• copolymerise
• copolymerize