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

1. Every half year, every six months

See also: periodic, periodical

• sea-puss
• sea-rocket
• seabag
• seabeach sandwort
• seabed
• seabird
• seaboard
• Seaborg
• seaborgium
• seaborne
• seacoast
• seafarer
• seafaring
• seafood
• seafood Newburg
• seafood sauce
• seafowl
• seafront
• seagirt
• seagoing
• seagrass
• seagull
• seahorse
• seal
• seal bomb