How many ways is a normal mirror, then? Do we call it a "no way mirror"?

A one-way mirror is only one-way when the lighting conditions are correct. Otherwise you can see right through it from both sides

Well I mean dictionaries. Kind of like how webster defines literally with

Definition 1: In a literal manner such as ....

Definition 2: used in an exaggerated way to emphasize a statement or description that is not literally true or possible.