Here’s an economical word 😉 It means two mutually-exclusive thing at once:
1. twice a month
2. once every two months
In fact, the meaning of “bimonthly” (and similar words like “biweekly” and “biyearly”) is ambiguous. The best way to be unambiguous is to use alternative expressions such as “twice a month” or “every two months”.
By Josef Essberger for EnglishClub November 2007
Josef started teaching English as a foreign language in 1991 and founded EnglishClub for learners and teachers in 1997.