'ix' definitions:

Definition of 'ix'

From: WordNet
adjective
Denoting a quantity consisting of one more than eight and one less than ten [syn: nine, 9, ix]
noun
The cardinal number that is the sum of eight and one [syn: nine, 9, IX, niner, Nina from Carolina, ennead]

Definition of 'ix'

From: GCIDE
  • 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]