fifth in WordNet English dictionary

1. coming next after the fourth and just before the sixth in position
   fifth  5th 
   

1. the musical interval between one note and another five notes away from it
   fifth 
   
2. one part in five equal parts
   one-fifth  fifth  fifth part  twenty percent 
   
3. a quantity of liquor equal to one fifth of a United States gallon
   fifth 
   
4. position five in a countable series of things
   "he was fifth out of several hundred runners"
   fifth