Yes I know that, but isn't "the change from one velocity to another" defined as "accelerating"? I think this is just a matter of definitions, a conceptual thing, but physically we mean to describe the same. That's what I try to say.

Then again maybe teleporting isn't describable by the true definition of acceleration, unless teleporting without acceleration is not physically possible.

Yes I agree change in velocity is a more general description than acceleration, and thus be the preferred term to use.