ninth

ninth

[na͟ɪnθ]
 ♦♦
 ninths
 1) ORD The ninth item in a series is the one that you count as number nine.
  ...January the ninth.
  ...students in the ninth grade.
  ...ninth century illustrated manuscripts.
 2) FRACTION A ninth is one of nine equal parts of something.
  In Brussels the dollar rose by a ninth of a cent...
  What you see is only the tip. Eight ninths of it is under the sea.