CTD writes:
From what I've seen, evolutionists don't believe in fixity of language any more than they believe in fixity of species. I think this case demonstrates what I mean.
Two thoughts.
1. Wow... why the sudden appearance of "evolutionists" into the discussion. I am going to suppose from this that your own definition of Christian excludes anyone who might believe in evolution. So folks like Francis Collins and many Catholics, Anglicans, etc. are out in your way of thinking.
2. That is correct! language is not fixed and either are species. To discover the reality in these areas consult early English literature, such as the works by Chaucer, for the former and the closest Natural History museum for the latter.