Could you not have googled this one?
Yes I could, there are two definitions out there as per the question in the OP.
I know how I’d interpret it, I’m curious to see how many others interpret it in the same way.
So far it seems one poster has a hard view on one and might be unaware that this is even a possible question, at least he thinks it shouldn’t be. Someone else is aware it can mean both but has gone with the same answer.
Poll possible? I’m assuming fortnightly/every two weeks will dominate.