One hill I will die on: bi-weekly should only ever mean twice a week. Semi-weekly (or fortnightly) is for once every two weeks.

I will mute everyone who disagrees and pretend they never existed

PhD in aviation ∩ climate science | Aviator, diver, ETH maxi, nexialist | Host of /diving /ethfinance /eth-staker /geopolitics /science /singapore /thomas

hold on, just hear me out……..i don’t disagree but i don’t agree either.
how’s that?

ambivalent 
i only agree with fortnightly, i’ve always been forced to agree with the meaning bi weekly by my dictionary and teachers, it doesn’t sound right in my head but i’ve learnt to live with it.

i don’t use semi-weekly in my vocabulary.