Similarly 'biweekly'. These words have 2 different meanings, meaning twice per month/week, or once every two months/weeks.
Firstly, what sort of imbecile decided to do this? Or was it a sneaky businessman who told a customer he'd deliver bimonthly if the customer paid bimonthly?
Secondly, how can we sensible people kill off one of the meanings to restore sanity?
I propose using twice monthly to mean twice a month, and keep bimonthly to mean once every two months, and also to introduce the new unit of time 'bimonth' which is two months.
For weeks, I propose using twice weekly and fortnightly and kill off the word biweekly completely.
What say you?
I just can't decide