The Correct spelling is: ninth
Common misspellings of the word ninth are:
How do you spell ninth?. It is not nineth
- The ordinal number matching the number nine in a series.
- One of nine equal parts.
- A harmonic or melodic interval of an octave and a second.
- The tone at the upper limit of such an interval.
- A chord consisting of a root with its third, seventh, and ninth.
[Middle English ninthe, from Old English nigonthe, from nigon, nine.]ninth ninth adv. & adj.