Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
half-yearly is an adjective and adverb meaning "occurring or payable twice each year". It carries 2 recorded senses.
occurring or payable twice each year
every half year, every six months
Definitions, synonyms and semantic relations for half-yearly come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.