1. Coming next after the fourth and just before the sixth in position
   - 5th

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

Derived forms: fifths

See also: fifthly, ordinal

Type of: common fraction, interval, musical interval, rank, simple fraction, United States liquid unit, vulgar fraction [Brit]

Encyclopedia: Fifth

• Phoronidea
• phosgene
• phosphatase
• phosphate
• phosphate buffer solution
• phosphatic
• phosphaturia
• phosphene
• phosphide
• phosphine
• phosphite
• phosphocreatine
• phospholipid
• phosphonium
• phosphoprotein
• phosphor
• phosphor bronze
• phosphoresce
• phosphorescence
• phosphorescent
• phosphoric
• phosphoric acid
• phosphorite
• phosphorous
• phosphorous acid