adverb
semiannually; every six months
Adverbial expression meaning something occurs once every half year.
この雑誌は半年ごとに発行されます。
This magazine is published semiannually.
半年ごとに健康診断を受けている。
I get a health checkup every six months.
Compound of 半年 (half year) + ごとに (each, every).