halfway in WordNet English dictionary

1. equally distant from the extremes
   center  halfway  middle  midway 
   
2. including only half or a portion
   "halfway measures"
   halfway 
   
3. at a point midway between two extremes
   "at the halfway mark"
   halfway 
   

1. at half the distance; at the middle
   "he was halfway down the ladder when he fell"
   halfway  midway  halfway  midway