- occurring or produced twice a month or every two months一月两次的; 两月一次的：
a bimonthly newsletter.
一月两期的时事通讯。
- twice a month or every two months一月两次; 两月一次。
(pl. -ies)
- a periodical produced twice a month or every two months半月刊; 双月刊。
USAGE
The meaning of bimonthly （and other similar words such as biweekly and biyearly） is ambiguous, as the above definition shows. The only way to avoid this ambiguity is to use alternative expressions like every two months and twice a month. In the publishing world, the meaning of bimonthly is more fixed and is invariably used to mean 'every two months'.