Twice a Month or Every Two Months?
According to Dictionary.com, Both!
Bimonthly can refer to something happening “every two months” or “twice a month.” Yep, bimonthly has, fittingly enough, two meanings.
You can always just be specific: “I’m setting up meetings twice a week” or “Let’s meet every other week.”
Or, you can take a page from British English’s playbook and use fortnightly. A fortnight is a period of two weeks. Fun fact: the fort in fortnight has nothing to do with Fort McHenry or the pillow forts you built as a kid. The word is smushed down from the Middle English fourtennight, from Old English fēowertēne niht—the span of fourteen nights (days).