Originally Posted by mightyrick
I think it's less ambiguous to just say, "You should do X every two weeks." Or. "You should do X twice per week."
Are we really that pressed for time these days that we can't use an extra word or two ensure that we're properly understood?
That phrasing works as an adverb but not as an adjective.
I'll stop contributing to the threadjack now... bottom line is that both meanings of "biweekly" are well-established and correct.