You prove the exception obviously, but any FPS player knows what hitscan is. Lightning Gun, Rail Gun, most "bullet" firing guns in about any game (especially older ones) save stuff like Armed Assault or Stalker. It's stuff that isn't projectile based, which is to say not rockets, plasma balls, grenades or balistically modelled bullets that you have to lead with. And people in this thread are not making up that meaning for it.
http://en.wikipedia.org/wiki/Hitscan <- altar of immutable truth
But what the hell am I posting links for? Google is available to anyone.