IX

from WordNet (r) 3.0 (2006)

ix
    adj 1: denoting a quantity consisting of one more than eight and
           one less than ten [syn: {nine}, {9}, {ix}]
    n 1: the cardinal number that is the sum of eight and one [syn:
         {nine}, {9}, {IX}, {niner}, {Nina from Carolina}, {ennead}]

from The Collaborative International Dictionary of English v.0.48

ix \ix\ adj.
   The Roman numerals signifying nine; denoting a quantity
   consisting of one more than eight and one less than ten.

   Syn: nine, 9.
        [WordNet 1.5]

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