The Ambiguity of 'Biweekly' and 'Bimonthly' | Merriam-Webster
https://www.merriam-webster.com/grammar/on-biweekly-and-bimonthly
WEBWhat to Know. Biweekly and bimonthly can mean the same thing because of the prefix bi-, which here can mean “occurring every two” or “occurring twice in.”. Therefore, biweekly can be “twice in a week” or “every other week.”. Bimonthly can also mean "every other week" if it's twice in a month, or it can mean “every other month.”.
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