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Adjective: half-yearly  hãf yeer-lee
  1. Occurring or payable twice each year
    "You must submit half-yearly compliance reports";
    - semiannual, biannual, biyearly
Adverb: half-yearly  hãf yeer-lee
  1. Every half year, every six months
    "The company releases financial reports half-yearly"

See also: periodic, periodical