I'm not entirely sure what that means since it suggests we currently have the "wrong" definition of the word, but if there is a class of intelligence that gets created that it so far on a different tier from human intelligence that we think a separate word is needed, I would expect two things:

1) We aren't going to be the ones seeing that distinction or labeling it, the greater intelligence is

2) So the word "sentient" won't need to be changed; a new term will need to be created, but we won't really understand what it means