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

1. Every half year, every six months

See also: periodic, periodical

• moth miller
• moth mullein
• moth orchid
• moth plant
• moth-eaten
• moth-resistant
• mothball
• mother
• mother board
• Mother Carey's chicken
• Mother Carey's hen
• mother cell
• mother country
• mother figure
• Mother Goose
• mother hen
• Mother Hubbard
• Mother Jones
• mother lode
• mother of thyme
• Mother Seton
• mother superior
• Mother Teresa
• Mother Theresa
• mother tongue