Happening twice each year; semi-annually; six-monthly; biannual.(adjective)
Twice each year; semi-yearly; biannually.(adverb)
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Use "twice-yearly" in a sentence
"But in its twice-yearly Regional Economic Outlook for Europe, the IMF warned that many economies face major challenges if they are to maintain the recovery."
"It is more than 40% higher than the mark set last June by a system called Jaguar at Oak Ridge National Laboratory that previously stood at No. 1 on a twice-yearly ranking of the 500 fastest supercomputers."
"My name is spelled incorrectly on the annual assessment notice and the twice-yearly property tax bills for my residence that I receive in the mail."