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DAE refuse to use the word "biweekly" because it has two different definitions?
(self.doesanybodyelse)
The place for asking whether anybody else does the same stupid stuff like you do
There are two definitions, according to the major dictionaries I can view (OED requires a subscription):
https://www.merriam-webster.com/dictionary/biweekly https://dictionary.cambridge.org/dictionary/english/biweekly https://en.wiktionary.org/wiki/biweekly https://www.dictionary.com/browse/biweekly
So, the usage of biweekly as a synonym for semi-weekly is sufficiently high enough to land it in the dictionary, alongside a definition of every-two-weeks, and make biweekly an ambiguous and confusing term.