This is the only word I know of whose meaning can be redefined by majority consensus.

Case in point, my workplace wanted a bi-weekly committee meeting for our team to work on stuff over a zoom call. I asked what days these meetings would be held and they all agreed “Just Thursdays”. When I tried to argue that a bi-weekly meeting necessarily means that there must be two distinct dates per week, they all agreed that bi-weekly obviously means every other Thursday and that I didn’t understand what the word bi-weekly meant 😒