·noun The next in order after the eighteenth.
II. Nineteenth ·noun An interval of two octaves and a fifth.
III. Nineteenth ·adj Constituting or being one of nineteen equal parts into which anything is divided.
IV. Nineteenth ·adj Following the eighteenth and preceding the twentieth; coming after eighteen others.
V. Nineteenth ·noun The quotient of a unit divided by nineteen; one of nineteen equal parts of anything.