Nineteenth

1. n. An interval of two octaves and a fifth.
2. a. Following the eighteenth and preceding the twentieth; coming after eighteen others.
3. a. Constituting or being one of nineteen equal parts into which anything is divided.
4. n. The quotient of a unit divided by nineteen; one of nineteen equal parts of anything.
5. n. The next in order after the eighteenth.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.