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Adjective: biyearly  bI'yeer-lee
  1. Occurring every second year
    "they met at biyearly conventions";
    - biennial
     
  2. Occurring or payable twice each year
    "You must submit biyearly compliance reports";
    - semiannual, biannual, half-yearly
Adverb: biyearly  bI'yeer-lee
  1. Every two years
    "this festival takes places biyearly";
    - biennially
     
  2. Twice a year
    - semiannually

See also: periodic, periodical