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Adjective: biyearly  bI'yirlee [N. Amer], bI'yiulee [Brit]
  1. Occurring every second year
    - biennial
     
  2. Occurring or payable twice each year
    - semiannual, biannual, half-yearly
Adverb: biyearly  bI'yirlee [N. Amer], bI'yiulee [Brit]
  1. Every two years
    - biennially
     
  2. Twice a year
    - semiannually

See also: periodic, periodical