[johnny]

So basically, use the language the reinforces the world (or society) created in the story?

I always over-think myself and my writing by assuming what readers might think or have problems with, but the consensus seems to be that, if I prioritize the society I've created and the rules of that world (even the rules borrowed from real Earth history) then readers should be able to overlook stuff that doesn't quite make sense -- so long as the stuff that doesn't make sense compared to our world does make sense within the boundaries of the fictional world.