seventh

seventh

[se̱v(ə)nθ]
 ♦♦
 sevenths
 1) ORD The seventh item in a series is the one that you count as number seven.
  I was the seventh child in the family. There were 11 of us altogether.
 2) FRACTION A seventh is one of seven equal parts of something.
  A million people died, a seventh of the population.