Translation

隔月の / 二か月に一度の / 月二回の

Meaning

Bimonthly is risky because it can mean every two months or twice a month. Many readers cannot tell which meaning you intend without context. For schedules, write every two months or twice a month instead.

Examples

• 理事会は二月、四月、六月に隔月の会議を開きます。
  The board holds bimonthly meetings in February, April, and June.
• 私たちの隔月レポートは一か月おきに発行されます。
  Our bimonthly report comes out every other month.