The rules you've consciously learned about language constitute a tiny fraction of the rules that govern our use of language. Many of them ("don't split infinitives!", "no prepositions at the end of a sentence!") fail to be descriptive.
Not that it matters, but "biweekly", "biannually", and "bimonthly" have always only had a single meaning for me. I've heard the debate about them, but I don't think I've ever actually seen them used to mean "once every two weeks/months/years".
Not that it matters, but "biweekly", "biannually", and "bimonthly" have always only had a single meaning for me. I've heard the debate about them, but I don't think I've ever actually seen them used to mean "once every two weeks/months/years".