Definitions for "Nineteenth"
Following the eighteenth and preceding the twentieth; coming after eighteen others.
The next in order after the eighteenth.
position 19 in a countable series of things
Constituting or being one of nineteen equal parts into which anything is divided.
The quotient of a unit divided by nineteen; one of nineteen equal parts of anything.
Keywords:  octaves, fifth, interval, two
An interval of two octaves and a fifth.