If your therapy group has semimonthly meetings,
how often should you expect to show up? A bimonthly meeting
should take place “once every two months"; a biweekly, “once
every two weeks.” A semimonthly meeting should be held “twice a
month” and a semiweekly “twice a week.” That’s should.
These words are often confused, and to spare nervous attendees the
suspense, the only decent thing to do is to use substitute expressions
like every two months or twice a month.
In the publishing world, where confusion is a rarity,
a bimonthly always comes out every two months, and a biweekly
every two weeks