Ninth Definition
 nīnth 
    noun
  
 The one following the eighth.
 Webster's New World 
The ordinal number matching the number nine in a series.
 American Heritage 
Any of the nine equal parts of something;19
 Webster's New World 
An interval in pitch of an octave and a second.
 Webster's New World 
A tone separated from another by such an interval.
 Webster's New World 
Synonyms: 
  
    adjective
  
 Preceded by eight others in a series; 9th.
 Webster's New World 
Designating any of the nine equal parts of something.
 Webster's New World 
Synonyms: 
  
    adverb
  
 In the ninth place, rank, group, etc.
 Webster's New World 
Other Word Forms of Ninth
Noun
Singular:
 ninthPlural:
 ninthsOrigin of Ninth
-  Middle English ninthe from Old English nigonthe from nigon nine newn̥ in Indo-European roots From American Heritage Dictionary of the English Language, 5th Edition 
- Middle English ninthe, from Old English nigoþa (nigonthe), from nigon (“nine") - From Wiktionary 
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