one fifth

/wʌn fɪfθ/
noun
  1. One of five equal parts of a whole; 1/5.
    • He donated one-fifth of his salary to charity.
    • The bottle holds one-fifth of a gallon.
    • Only one-fifth of the students passed the difficult exam.
adjective
  1. Being one of five equal parts; equal to 1/5.
    • The recipe requires a one-fifth teaspoon of salt.
    • They built a one-fifth scale replica of the ship.
    • A one-fifth share of the profits was given to each partner.