1. Occurring every second year
   - biennial 
2. Occurring or payable twice each year
   - semiannual, biannual, half-yearly

1. Every two years
   - biennially 
2. Twice a year
   - semiannually

See also: periodic, periodical

• license number
• license plate
• license tax
• licensed
• licensed practical nurse
• licensee
• licenser
• licensing agreement
• licensing fee
• licensor
• licensure
• licentiate
• licentious
• licentiously
• licentiousness
• lich
• Lichanura
• Lichanura trivirgata
• lichee
• lichen
• lichen planus
• lichen ruber planus
• Lichenales
• Lichenes
• lichenology