ninth /ˈnaɪn(t)θ/
  第九九分之一
  Ninth a.
  1. Following the eight and preceding the tenth; coming after eight others.
  2. Constituting or being one of nine equal parts into which anything is divided.
  Ninth, n.
  1. The quotient of one divided by nine; one of nine equal parts of a thing; the next after the eighth.
  2. Mus. (a) An interval containing an octave and a second. (b) A chord of the dominant seventh with the ninth added.
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  ninth
       adj : coming next after the eighth and just before the tenth in
             position [syn: 9th]
       n 1: position nine in a countable series of things; "going into
            the ninth they were a run ahead"
       2: a ninth part [syn: one-ninth]